ORDER

         Honorable R. Brooke Jackson, United States District Judge.

         Presently before the Court is Plaintiffs' Motion to Certify Class and Appoint Class Counsel [ECF No. 99/100]. For the reasons set forth below, the motion is denied.

         I. Facts

         The plaintiffs or their loved ones are all former DaVita patients who suffered heart attacks during or soon after dialysis treatments at DaVita clinics. As relevant here, dialysis is a process that reproduces about 10 to 15 percent of kidney function in patients with End Stage Renal Disease; it is typically performed three times per week for about three hours at a time. ECF No. 151 (Transcript of April 29, 2015 hearing (Day One Tr.)) at 229. One important purpose of dialysis is controlling the pH level of a patient's blood, which would otherwise become too acidic in the absence of properly-functioning kidneys. Id. at 231-32. Dialysis accomplishes this through the use of a dialysate, a substance that, when placed in a machine through which the patient's blood circulates during the course of a treatment, allows electrolytes to diffuse into the blood. Id. at 229.

         One such electrolyte, bicarbonate, counteracts the buildup of acid that occurs naturally from physical activity and the ingestion of food. Id. at 232. After bicarbonate enters a patient's blood during a dialysis treatment, the patient's bicarbonate level peaks; it then begins to drop over the next few days as the patient moves and eats, before peaking again during or soon after the next dialysis treatment. Id. at 233. Determining the amount of bicarbonate that a patient should receive during dialysis is an important part of the role performed by the patient's nephrologist. Id. at 235-36. Thus, when a nephrologist writes a dialysis prescription, he or she includes a specific level of bicarbonate as part of the prescription. Id. That level tends to be between 30 and 40 milliequivalents per liter, with an average of 37. Id. at 238.

         A patient, however, does not receive bicarbonate only in direct form from the dialysate. Id. at 237-38. All dialysates also contain some amount of acetate, an acid-like substance that is very efficiently converted into bicarbonate by the patient's liver and thus provides an additional source of bicarbonate during dialysis. Id. at 238. A typical dialysate contains 4 milliequivalents of acetate. Id. at 237. In contrast, the dialysate that DaVita used when treating the plaintiffs--GranuFlo or NaturaLyte--contain 8 milliequivalents. Id. ; ECF No. 90 at ¶ 12. Plaintiffs contend that DaVita failed to account for this extra acetate when treating patients with GranuFlo and thus delivered more bicarbonate to patients than they should have received according to their nephrologists' prescriptions.

         On plaintiffs' theory, this extra bicarbonate increased the risk of serious negative health consequences in some patients treated with GranuFlo. According to the plaintiffs' expert witness, Dr. Borkan, excess bicarbonate is problematic for patients with high predialysis bicarbonate levels. Day One Tr. at 239. For these patients, the additional bicarbonate they receive during dialysis can cause their bicarbonate levels to spike to dangerous levels, resulting in metabolic alkalosis, a condition in which a patient's pH level is too high. Id. at 239-40. Metabolic alkalosis is associated with an increased risk of ischemic strokes, heart attacks, myocardial infraction, and fatal arrhythmias. Id. at 257-59, 266. On the other hand, patients with low predialysis bicarbonate levels--who are at risk for metabolic acidosis, a condition characterized by low pH levels--may benefit from the extra bicarbonate they receive as a result of the higher acetate content of GranuFlo. Id. at 248. Dr. Borkan also noted that a rapid increase in bicarbonate can cause metabolic alkalosis in some patients with very low predialysis bicarbonate levels. Id. at 257; ECF No. 153 (Transcript of April 30, 2015 hearing (Day Two Tr.)) at 269-71.

         The plaintiffs believe that they (or in the case of Mr. Nunes, his wife) experienced heart attacks as a result of their exposure to GranuFlo, either during or soon after undergoing a dialysis treatment at a DaVita clinic. Ms. Morris, a resident of Minnesota, suffered a heart attack approximately 24 hours after completing such a treatment in April of 2012. ECF No. 90 at ¶ 25. Stella Nunes, the late wife of Melvin Nunes, suffered a heart attack while undergoing a dialysis treatment in California in December of 2012. Id. at ¶ 26. She passed away the next morning at the hospital. Id. Finally, Mr. Armstrong, also a resident of California, had a heart attack during a dialysis treatment in April of 2011. Id. at ¶ 23. Overall, Dr. Borkan estimated, a little over one to two percent of the patient population that received GranuFlo experienced a negative health outcome like a heart attack or stroke. Day One Tr. at 260.

         Indeed, in March of 2012, the U.S. Food and Drug Administration (" FDA" ) issued a Class 1 recall for GranuFlo and NaturaLyte that cautioned physicians to " be aware of the concentration of acetate or sodium diacetate" contained in the products. ECF No. 99-6, Recall Notice, at 2-3. The FDA's recall notice explained that

inappropriate prescription of these products can lead to a high serum bicarbonate level in patients undergoing hemodialysis. This may contribute to metabolic alkalosis, which is a significant risk factor associated with low blood pressure, hypokalemia, hypoxemia, hypercapnia and cardiac arrhythmia, which, if not appropriately treated, may culminate in cardiopulmonary arrest. This product may cause serious adverse health consequences, including death.

Id. at 3. Thus the recall warned physicians to take the acetate content of GranuFlo into account when writing prescriptions, but it did not remove the product form the market.

         Plaintiffs have brought claims for negligence, fraudulent concealment, and violations of the Colorado Consumer Protection Act (" CCPA" ). The motion presently before the Court seeks class certification for purposes of all three claims. The Court held a two-day evidentiary hearing in connection with the motion on April 29 and 30, 2015.

         II. Discussion

         It is axiomatic that a class action is an exception to the general rule that " litigation is conducted by and on behalf of the individual named parties only." Wal-Mart Stores, Inc. v. Dukes, 131 S.Ct. 2541, 2550, 180 L.Ed.2d 374 (2011) (internal citation and quotations omitted). Federal Rule of Civil Procedure 23 sets out the parameters governing class actions in federal courts. First, the proposed class must satisfy the prerequisites laid out in Rule 23(a): numerosity, commonality, typicality, and adequacy. Second, the putative class must fall into one of the categories listed in Rule 23(b). Plaintiffs here rely on both the second and third categories. Under the second, the Court may certify the putative class if " the party opposing the class has acted or refused to act on grounds that apply generally to the class, so that final injunctive relief or corresponding declaratory relief is appropriate respecting the class as a whole." Fed.R.Civ.P. 23(b)(2). The third permits certification if " the court finds that the questions of law or fact common to class members predominate over any questions affecting only individual members, and that a class action is superior to other available methods for fairly and efficiently adjudicating the controversy." Fed.R.Civ.P. 23(b)(3). A plaintiff seeking certification may also employ Rule 23(c)(4), which allows " an action [to] be brought or maintained as a class action with respect to particular issues."

         The U.S. Supreme Court emphasized that Rule 23 imposes weighty obligations on plaintiffs and certifying courts in its 2011 Dukes decision. 131 S.Ct. at 2551 (" certification is proper only if the trial court is satisfied, after a rigorous analysis, that the prerequisites of Rule 23(a) have been satisfied" ). " Frequently that 'rigorous analysis' will entail some overlap with the merits of the plaintiff's underlying claim." Id. Put another way, " sometimes it may be necessary for the court to probe behind the pleadings before coming to rest on the certification question." Id. Nevertheless, a peek at the merits is not an invitation to " turn the class certification proceedings into a dress rehearsal for the trial on the merits." Messner v. Northshore Univ. HealthSys., 669 F.3d 802, 811 (7th Cir. 2012). On the contrary, " Rule 23 grants courts no license to engage in free-ranging merits inquiries at the certification stage. Merits questions may be considered to the extent--but only to the extent--that they are relevant to determining whether the Rule 23 prerequisites for class certification are satisfied." Amgen Inc. v. Conn. Retirement Plans & Trust Funds, 133 S.Ct. 1184, 1194-95, 185 L.Ed.2d 308 (2013) (emphasizing that an evaluation of the probable outcome on the merits is not properly part of the certification decision). Some of the evidence presented by the parties at the class certification hearing, and discussed in this Order, is relevant to the merits. However, I cite it only to the extent I have found it necessary in deciding class issues and without expressing any opinion on the ultimate merits of the claims or defenses.

         In the present case, plaintiffs seek to certify various classes under Rule 23(b)(2), (b)(3), and (c)(4). First, they seek injunctive relief under Rule 23(b)(2) requiring DaVita to " (i) track the dialysate received by each patient and record that information in the patient's medical records; (ii) conduct a valid " look-back" program to determine which patients were exposed to GranuFlo in the past; and, (iii) notify GranuFlo-exposed patients that if they suffered cardiopulmonary arrest, myocardial infarctions, or ischemic strokes during or after GranuFlo dialysis, those events might be related to DaVita's administration of GranuFlo and may give rise to legal claims against DaVita." ECF No. 161 at 2. As for the 23(b)(3) class, plaintiffs have listed 13 issues on which they seek certification under 23(c)(4) in their original motion and two alternative issues in their post-hearing brief, each related to DaVita's actions surrounding its use of GranuFlo. ECF No. 99 at 32-38; ECF No. 161 at 5.

         Turning to the proposed class definitions, plaintiffs originally sought to certify a class of all patients who were treated with GranuFlo (or NaturaLyte) at DaVita clinics for purposes of all three claims (negligence, fraudulent concealment, and violations of the CCPA). ECF No. 90 at ¶ 69. DaVita estimates that this proposed class includes approximately 300,000 people, dispersed throughout the United States. Day One Tr. at 17. In their post-hearing brief, however, plaintiffs state that they have reconsidered their proposed class definition and instead seek certification of the following classes: (1) under Rule 23(b)(2), " [a]ll individuals dialyzed at a DaVita clinic following the introduction of GranuFlo," ECF No. 161 at 2; (2) for purposes of the CCPA claim under Rule 23(b)(3), " [a]ll DaVita patients dialyzed with GranuFlo since March 1, 2010 [the date on which DaVita moved its corporate headquarters to Colorado]," id. at 3; (3) for purposes of the fraudulent concealment claim under Rule 23(b)(3), the original class of all DaVita patients dialyzed with GranuFlo, id. at 4; and (4) an issue class under Rule 23(c)(4), for all three claims, consisting of " [a]ll [presumably DaVita] patients exposed to GranuFlo who suffered cardiopulmonary arrest, myocardial infarction or ischemic stroke either during dialysis with GranuFlo or within forty-eight hours after GranuFlo exposure," id. at 5. It appears that plaintiffs intend to stand by the original proposed class definition for purposes of the negligence claim under Rule 23(b)(3).

         Defendant opposes any certification and challenges the plaintiffs' standing for all of the proposed classes. The Court thus addresses the standing arguments first, then turns to the relevant Rule 23 analysis.

         A. Standing

         DaVita sets forth two standing arguments in its response: (1) the majority of the putative class members were not injured and thus lack standing, and (2) for purposes of 23(b)(2) certification, the named plaintiffs are not suffering from a continuing injury, and they therefore lack standing to seek injunctive relief. The Court will address each in turn.

         1. Non-named Plaintiffs' Standing

         Beginning with the first argument, the Tenth Circuit has made clear that that " Rule 23's requirements must be interpreted in keeping with Article III constraints." Vallario v. Vandehey, 554 F.3d 1259, 1269 n.7 (10th Cir. 2009) (internal citation omitted). " Article III . . . restricts the federal courts to the adjudication of 'Cases' and 'Controversies.' The standing inquiry ensures that a plaintiff has a sufficient personal stake in a dispute to ensure the existence of a live case or controversy which renders judicial resolution appropriate." Tandy v. City of Wichita, 380 F.3d 1277, 1283 (10th Cir. 2004) (internal citations omitted). In order to have standing to bring a claim, a plaintiff must have suffered an " injury in fact." Id. The defendant argues that the majority of the putative class members in the present case were not injured because, although everyone treated with GranuFlo may have experienced elevated bicarbonate levels, most did not suffer a cardiac event or other adverse health outcome. Thus, on DaVita's theory, most putative class members lack standing and the class cannot be certified.

         However, DaVita's argument assumes that all members of the proposed class must demonstrate standing in order to proceed as a class. In fact, courts are split on whether the standing analysis at the certification stage looks only to the named plaintiffs or to the proposed class as a whole. See In re Deepwater Horizon, 739 F.3d 790, 800-01 (5th Cir. 2014) cert. denied sub nom. BP Exploration & Prod. Inc. v. Lake Eugenie Land & Dev., Inc., 135 S.Ct. 754, 190 L.Ed.2d 641 (2014). The Tenth Circuit has made clear that " only named plaintiffs in a class action seeking prospective injunctive relief must demonstrate standing by establishing they are suffering a continuing injury or are under an imminent threat of being injured in the future." DG ex rel. Stricklin v. Devaughn, 594 F.3d 1188, 1197 (10th Cir. 2010). Thus, for purposes of 23(b)(2) certification, only the named plaintiffs must demonstrate that they have been injured, and DaVita's argument that many putative class members were not injured is immaterial to the standing analysis.

         Whether the Tenth Circuit has adopted this same approach in the 23(b)(3) context is less clear, but it appears that it has. The Stricklin opinion cites a Seventh Circuit case for the proposition that " [a] class will often include persons who have not been injured by the defendant's conduct. . . . Such a possibility or indeed inevitability does not preclude class certification." Id. at 1198 (quoting Kohen v. Pacific Inv. Mgmt. Co., 571 F.3d 672, 677 (7th Cir. 2009)). Thus this circuit has suggested that--in any context--plaintiffs need not show that the every member of a proposed class has been injured at the class certification stage. Moreover, in describing what appears to be the emerging majority approach, the Fifth Circuit concluded that the Tenth Circuit has " arguably" adopted this approach in the 23(b)(3) context:

In attempting to answer this question [of how courts are to evaluate standing for the purposes of class certification under Rule 23], courts have followed two analytical approaches. According to one approach, which has been endorsed by three Justices concurring in Lewis, several circuits, and an influential treatise, the inquiry hinges exclusively on the Article III standing of the " named plaintiffs" or " class representatives." This test requires courts to ignore the absent class members entirely . . . [T]his approach to the standing inquiry during class certification has been followed by the Seventh, Ninth, and Third Circuits. Additionally, the Tenth Circuit has adopted this test at least in " class action[s] seeking prospective injunctive relief" and arguably also in class actions for damages as well.

In re Deepwater Horizon, 739 F.3d at 800-01 (citing Stricklin ). The First Circuit also recently cited Stricklin --in a 23(b)(3) case--in support of the position that " [only] at least one named plaintiff must satisfy the actual injury component of standing in order to seek relief on behalf of himself or the class." In re Nexium Antitrust Litig., 777 F.3d 9, 32 (1st Cir. 2015).

         In light of this case law, the Court finds that only the named plaintiffs must demonstrate an injury in fact at this stage. DaVita's first standing argument does not assert that the named plaintiffs have not been injured (indeed, they all have been), but rather that " the vast majority of all putative class members" suffered no cognizable injury. ECF No. 112 at 7. Thus the defendant's argument fails as a matter of law.

         2. Standing under Rule 23(b)(2)

         DaVita also argues that the named plaintiffs themselves lack standing for purposes of the 23(b)(2) class. As noted above, " [the] named plaintiffs in a class action seeking prospective injunctive relief must demonstrate standing by establishing they are suffering a continuing injury or are under an imminent threat of being injured in the future." DG ex rel. Stricklin, 594 F.3d at 1197. It is not clear to the Court that the named plaintiffs are currently suffering or may soon suffer any injury. While the plaintiffs or their loved ones were undoubtedly injured in the past, there is no evidence suggesting that they are currently at risk of any negative health consequences associated with their prior treatment with GranuFlo. Plaintiffs' motion does not argue as much, but rather focuses on the fact that DaVita " denied . . . class members full knowledge about their own medical records." ECF No. 99 at 45.

         On plaintiffs' theory, the injury that forms the basis for the proposed injunctive relief class is the denial of " complete and accurate information about [putative members'] medical history, treatments, and course of care." Id. However, the named plaintiffs have all learned through discovery that they were treated with GranuFlo at DaVita clinics. Day One Tr. at 16-17, 77-78. For this reason, even assuming that the lack of knowledge that a patient was treated with GranuFlo at some point in the past is a cognizable injury, the named plaintiffs are not suffering this injury. They therefore lack standing for purposes of injunctive relief and cannot represent a class under Rule 23(b)(2).

         Indeed, the Southern District of New York recently denied a motion for class certification on similar grounds in Vaccariello v. XM Satellite Radio, Inc., 295 F.R.D. 62 (S.D.N.Y. 2013). In that case, the plaintiff brought suit against a company that provides subscription-based satellite radio service, alleging that the company's practice of automatically renewing subscriptions violated consumer protection laws. Id. at 66. The plaintiff sought injunctive relief under Rule 23(b)(2) requiring the defendant to provide notice of its automatic renewal practices to its customers. Id. The Court declined to certify a 23(b)(2) class because the named plaintiff was not presently suffering the complained-of injury:

The crux of plaintiffs' complaint is that [defendant] XM's customers unwittingly pay extra fees because they are unaware that their service automatically renews. As a result of his billing dispute with defendant, [the plaintiff] is now clearly aware of XM's billing practices. Given this knowledge, plaintiff is not likely to unwittingly face automatic renewal and its accompanying fees. Accordingly, there is insufficient evidence that [he] is likely to suffer future harm from XM's policies.

Id. at 72. See also Cattie v. Wal-Mart Stores, 504 F.Supp.2d 939, 951 (S.D. Cal. 2007) (declining to grant injunctive relief where plaintiff lacked standing because she was--at the time of the suit--fully aware of defendant's alleged false advertising and " if [a plaintiff] may not seek injunctive relief, the standing of unnamed class members will not suffice to give the Court jurisdiction to grant it" ). Similarly in the present case, the named plaintiffs cannot seek injunctive relief where the alleged injury is the concealment of information that they now possess. Even assuming a class of DaVita patients who are unaware that they were treated with GranuFlo could be certified under 23(b)(2) on the basis of this alleged injury, the named plaintiffs in the present case could not represent that class. Thus the Court denies the plaintiffs' motion for certification as to the 23(b)(2) class, and I proceed to analyze only the proposed 23(b)(3) class under Rule 23's requirements.

         B. The Rule 23(a) Requirements

         As noted above, a plaintiff seeking to certify any class under Rule 23 must satisfy the prerequisites laid out in Rule 23(a). This provision requires that

(1) the class is so numerous that joinder of all members is impracticable; (2) there are questions of law or fact common to the class; (3) the claims or defenses of the representative parties are typical of the claims or defenses of the class; and (4) the representative parties will fairly and adequately protect the interests of the class.

Fed. R. Civ. P. 23(a). As an initial matter, plaintiffs argue that for purposes of the proposed 23(b)(3) class they need only satisfy the 23(a) requirements with respect to the issues on which they seek 23(c)(4) certification, not for the class as a whole. While the numerosity and adequacy analyses here are not impacted by the fact that plaintiffs seek certification pursuant to 23(c)(4), the Court agrees that the commonality and typicality requirements should be examined only with respect to the 23(c)(4) issues. See Charrons v. Pinnacle Group N.Y. LLC, 269 F.R.D. 221, 241 (S.D.N.Y. 2010) (" [W]hen a Court chooses to limit class certification only to certain common issues under Rule 23(c)(4) . . . [it] goes almost without saying that the related requirements of commonality and typicality are . . . met." ); Simon v. Philip Morris Inc., 200 F.R.D. 21, 29 (E.D.N.Y. 2001) (Rule 23(c)(4) " accords district judges the discretion to certify a class action as to particular issues in a manner that treats common things in common and distinguishes the distinguishable, thereby satisfying Rule 23(a)'s requirements of commonality and typicality." ). Accordingly, in the following analysis, the Court considers commonality and typicality only with respect to the issues on which plaintiffs seek 23(c)(4) certification. As laid out below, the Court finds that plaintiffs have satisfied the 23(a) prerequisites for certification.

         1. Numerosity

         To satisfy numerosity, plaintiffs first must show that the putative class is ascertainable. Joseph v. Gen. Motors Corp., 109 F.R.D. 635, 638-39 (D. Colo. 1986). While the class does not have to be " so ascertainable that every potential member can be specifically identified at the commencement of the action, the description of the class must be sufficiently definite so that it is administratively feasible for the court to ascertain whether a particular individual is a member." Id. (internal citations omitted). In other words, " the class must be defined with reference to objective criteria [and] there must be a reliable and administratively feasible mechanism for determining whether putative class members fall within the class definition." Hayes v. Wal-Mart Stores, Inc., 725 F.3d 349, 355 (3d Cir. 2013). Moreover, if a court must undertake extensive individualized inquiries into whether a putative member falls within the class definition, certification is not appropriate. See Davoll v. Webb, 160 F.R.D. 142, 146 (D. Colo. 1995) aff'd, 194 F.3d 1116 (10th Cir. 1999) (" Various factors would have to be considered in determining whether each named Plaintiff and each member of the putative class has or will have a 'disability' for the purposes of an ADA claim. Such necessarily individualized inquiries are best suited to a case-by-case determination." ).

         In the present case, the putative class includes every DaVita patient who was treated with GranuFlo at any point in time (or, for the CCPA claim, after March 1, 2010) or, alternatively, just those who experienced a serious negative health outcome. DaVita apparently did not record in patients' medical records which dialysate was administered to them. However, it is possible to determine whether a patient probably was or was not treated with GranuFlo. If individual clinics used only one dialysate product at a time, then one can determine from purchasing records when GranuFlo was being used at the clinic and compare that data to the patient's records, resulting in a reasonable inference that the patient was or was not treated with GranuFlo, and if so, during what period of time. See Day One Tr. at 53-54. The present case illustrates this process. The original Complaints in these consolidated cases named 13 individuals who allegedly suffered serious adverse health effects from the use of GranuFlo in their dialysis treatments. However, partly as a result of the process described above, the number of plaintiffs was reduced to the present three.

         Whether that process is administratively feasible when applied to 300,000 patients is debatable. And that is only one step in the process, because the records of those who are found to have received GranuFlo must be examined to identify the smaller number, estimated by Dr. Borkan to be in the range of one to two percent of the total (so roughly between 3,000 and 6,000 patients) who experienced serious adverse health effects during or shortly after a treatment with a GranuFlo dialysate. Thus, if the question is whether it is possible to identify the members of the class, the answer is " yes." If the question is whether it is administrative feasible to do this, the answer might be different, depending upon who is asking the question. DaVita would answer " no," since it would be the one to do the work. For purposes of the numerosity requirement, I will answer the question with a weak " yes." But, this administrative problem is still part of the mix when I later get to the question of whether a class action is " superior to other available methods for fairly and efficiently adjudicating the controversy" per Rule 23(b)(3).

         In order to be certified, the proposed class also must be so numerous that joinder is impracticable. Fed.R.Civ.P. 23(a); Trevizo v. Adams, 455 F.3d 1155, 1162 (10th Cir. 2006). Defendant concedes that " the class proposed would be immense." ECF No. 112 at 35. Indeed, the parties estimate that the putative class of all DaVita patients treated with GranuFlo consists of nearly 300,000 individuals. The proposed CCPA class consists of some portion of that number, and a conservative estimate of the number of individuals in the alternative class of just those patients who were seriously injured is in the range of 3,000 to 6,000 people. In any case, joinder is clearly impractical. Thus plaintiffs have shown that the proposed class is ascertainable and sufficiently numerous, and the Court finds that they have satisfied Rule 23(a)'s numerosity requirement.

         2. Commonality

         In order to satisfy the prerequisite of commonality, a putative class must raise a common contention that is " capable of classwide resolution--which means that determination of its truth or falsity will resolve an issue that is central to the validity of each one of the claims in one stroke." Wal-Mart Stores, 131 S.Ct. at 2551 (finding that plaintiffs failed to demonstrate commonality because it was " quite unbelievable" that thousands of Wal-Mart managers across different regions of the country " would exercise their discretion in a common way without some common direction" ). " What matters to class certification is not the raising of common questions--even in droves--but, rather the capacity of a classwide proceeding to generate common answers apt to drive the resolution of the litigation. Dissimilarities within the proposed class are what have the potential to impede the generation of common answers." Id. (internal citation, quotations, and alterations omitted).

         Here, as noted above, the fact plaintiffs seek certification only on particular issues under 23(c)(4) strongly weighs in favor of finding commonality. See Charrons, 269 F.R.D. at 241; Simon, 200 F.R.D. at 29. See also In re Tetracycline Cases, 107 F.R.D. 719, 729 (W.D. Mo. 1985) (finding that " [i]n an abstract sense, at least, [the commonality] requirement is clearly met" where plaintiffs employ Rule 23(c)(4) to isolate common issues of law and fact). Although the Supreme Court clarified in Dukes that commonality requires not just common questions--which are by definition present under 23(c)(4)--but also common answers, it seems likely that well-framed issues raised under 23(c)(4) will satisfy the commonality requirement.

         In the present case plaintiffs have laid out common issues central to their claims, the answers to which can be decided on a classwide basis. See ECF No. 99 at 32-38 (listing 13 common issues on which plaintiffs seek certification); ECF No. 161 at 5 (listing an additional two issues). Not all 15 issues are appropriate for certification. The first--whether GranuFlo, when administered according to DaVita policies and procedures leads to elevated bicarbonate levels and alkalosis--is not capable of classwide resolution on a " yes" or " no" basis; even on plaintiffs' theory of the facts, not all patients treated with GranuFlo will experience alkalosis. See Day One Tr. at 239-40. The first alternative issue listed in plaintiffs' post-hearing brief is problematic for the same reason. See ECF No. 161 at 5. The third issue from plaintiffs' motion--whether DaVita adequately investigated GranuFlo before it began using it--should not be included in light of this Court's Orders on DaVita's two motions to dismiss [ECF Nos. 69 and 126]. Finally, the last issue (labeled number 13) is not relevant in light of the Court's decision not to certify a class for injunctive relief. The remaining 11 issues (10 from the motion and one from the post-trial brief) concern GranuFlo's effect on bicarbonate levels, DaVita's monitoring of patient data, DaVita's company-wide practices and procedures, DaVita's knowledge about problems associated with the use of GranuFlo, whether DaVita concealed information from its patient population, DaVita's duties as a corporation, and whether DaVita committed an unfair or deceptive trade practice. ECF No. 99 at 32-38. These all raise questions that can be answered on a classwide basis in a single stroke, and thus the Court finds that commonality exists as to these 11 questions.

         3. Typicality

         In general, " typicality exists where . . . all class members are at risk of being subjected to the same harmful practices, regardless of any class member's individual circumstances." Stricklin, 594 F.3d at 1199. In other words, " [t]he test of typicality is whether other members have the same or similar injury, whether the action is based on conduct which is not unique to the named plaintiffs, and whether other class members have been injured by the same course of conduct." Ellis v. Costco Wholesale Corp., 657 F.3d 970, 984 (9th Cir. 2011) (internal citations and quotations omitted). However, as noted above, the use of Rule 23(c)(4) narrows the typicality analysis to the issues on which certification is sought. See Charrons, 269 F.R.D. at 241. The typicality inquiry is closely related to that of commonality: " The commonality and typicality requirements of Rule 23(a) tend to merge." Wal-Mart Stores, 131 S.Ct. at 2549 n.5 (internal citation and quotations omitted). Moreover, as noted above, when plaintiffs seek certification under Rule 23(c)(4) to isolate issues common to the proposed class, typicality is satisfied almost by definition. See Charrons, 269 F.R.D. at 241; Simon, 200 F.R.D. at 29 (E.D.N.Y. 2001).

         Here, for purposes of 23(b)(3) certification under 23(c)(4), the Court is satisfied that the plaintiffs have demonstrated typicality. The issues on which they seek certification all turn on DaVita's conduct with respect to its use of GranuFlo and its policies and practices surrounding the monitoring of patient data. DaVita's conduct, as relevant to the 11 issues on which commonality exists, was not unique to any particular plaintiff; to the extent that members of the proposed class were injured by this conduct, the same course of conduct on DaVita's part caused those injuries. For these reasons, the proposed 23(b)(3) class satisfies Rule 23(a)'s typicality requirement.

         4. Adequacy

         Finally, Rule 23(a) requires that the plaintiffs and plaintiffs' counsel adequately represent the class. This analysis involves many of the same factors analyzed above in the commonality and typicality sections. See Wal-Mart Stores, 131 S.Ct. at 2549 n.5. However, it also requires consideration of (1) whether there are any conflicts between members of the class or class counsel and (2) whether the named class members and their counsel will vigorously prosecute the case. See Rutter & Wilbanks Corp. v. Shell Oil Co., 314 F.3d 1180, 1187-88 (10th Cir. 2002) (citing Amchem Prods., Inc. v. Windsor, 521 U.S. 591, 626 n.20, 117 S.Ct. 2231, 138 L.Ed.2d 689 (1997)).

         The Court finds that both the named plaintiffs and their counsel would adequately represent the class. In the context of the 11 questions for which the Court found commonality above, the interests of all putative class members are aligned (for example, all would benefit from an affirmative answer to the question of whether DaVita failed to adequately monitor patient data and outcomes). Although the majority of putative members have only a consumer protection claim (under the broadest proposed class definition), while the three named plaintiffs also seek damages for severe injuries or death, there is no indication in the record of conflict among class members or between class members and counsel. These different types of claims are complementary, not contradictory. Moreover, the Court has no reason to believe that the plaintiffs and their well-qualified counsel will not vigorously prosecute the case, as they have done to date.

         DaVita argues that the plaintiffs' attorneys cannot adequately represent the putative class because of their involvement in litigation against Fresenius, the manufacturer of GranuFlo. ECF No. 112 at 39-40. Specifically, defendant contends, the plaintiffs here have not joined Fresenius in the present action, and plaintiffs' counsel have taken factual and legal positions in the Fresenius litigation that are adverse to their clients' interests in the present case. Id. at 40. The Court is not persuaded by either of these arguments. Plaintiffs are entitled to make strategic decisions about the joinder of other parties, and defendant has not pointed to any inconsistency between positions taken in the two cases that the Court finds problematic. In its response, DaVita highlights only the fact that plaintiffs in the Fresenius litigation contend that Fresenius had exclusive control over non-public information about the nature of GranuFlo, ECF No. 99 at 38; here the heart of plaintiffs' case is that DaVita should have or did discover this information on its own. Although there is some evidence suggesting that DaVita may have received certain documents from Fresenius regarding the dangers associated with GranuFlo, the Court does not find this small inconsistency fatal to counsel's ability to represent the plaintiffs in this case. In sum, DaVita's arguments do not convince the Court that plaintiffs or their counsel will not adequately represent the class, and the Court finds that plaintiffs have satisfied the adequacy requirement.

         C. The Rule 23(b)(3) and 23(c)(4) Requirements

         Having found that plaintiffs have satisfied the prerequisites of Rule 23(a), the Court now turns to an analysis of the requirements for certification under 23(b)(3) and 23(c)(4). Plaintiffs have set forth 15 issues related to DaVita's actions or lack thereof, 11 of which the Court found appropriate for certification under the 23(a) analysis above. In order to certify a 23(b)(3) class on these issues, the Court must find that " the questions of law or fact common to class members predominate over any questions affecting only individual members, and that a class action is superior to other available methods for fairly and efficiently adjudicating the controversy." Fed.R.Civ.P. 23(b)(3). Furthermore, " [t]he matters pertinent to these findings include:

(A) the class members' interests in individually controlling the prosecution or defense of separate actions; (B) the extent and nature of any litigation concerning the controversy already begun by or against class members;

(C) the desirability or undesirability of concentrating the litigation of the claims in the particular forum; and

(D) the likely difficulties in managing a class action."

Id. Thus the Court examines (1) predominance and (2) superiority in determining whether certification is appropriate pursuant to 23(b)(3). Lastly, the Court considers whether certification under 23(c)(4) will materially advance the litigation. See In re Motor Fuel Temperature Sales Practices Litig., 279 F.R.D. 598, 609 (D. Kan. 2012).

         1. Predominance

         As an initial matter, the parties disagree about how Rule 23(c)(4) affects the 23(b)(3) predominance analysis. Courts are split on whether a plaintiff's entire claim or only the specific issues on which he seeks certification must satisfy the predominance requirement. See, e.g., In re Nassau Cnty. Strip Search Cases, 461 F.3d 219, 227 (2d Cir. 2006) (" [A] court may employ subsection (c)(4) to certify a class as to liability regardless of whether the claim as a whole satisfies Rule 23(b)(3)'s predominance requirement." ); Castano v. Am. Tobacco Co., 84 F.3d 734, 745 (5th Cir. 1996) (" A district court cannot manufacture predominance through the nimble use of subdivision (c)(4). . . . [A] cause of action, as a whole, must satisfy the predominance requirement of (b)(3) . . . [even where c(4)] allows courts to sever the common issues for a class trial." ). While it does not appear that the Tenth Circuit has adopted either approach, the District of Kansas recently held that courts need only consider the specific issues on which a plaintiff seeks certification: " Although the Tenth Circuit has not addressed the question, this Court has generally followed the approach of the Second, Seventh and Ninth Circuits, and has used Rule 23(c)(4) to certify parts of claims where doing so would materially advance the disposition of the litigation of the whole." In re Motor Fuel Temperature Sales Practices Litig., 292 F.R.D. at 664-65 (internal citations and quotations omitted). This appears to be the majority approach. See id. This Court will therefore follow the approach embraced by the District of Kansas and consider only the issues on which plaintiffs seek 23(c)(4) certification in analyzing whether questions of law or fact common to class members predominate over any questions affecting only individual members.

         Despite DaVita's thorough attempt to show otherwise, it seems clear that--considering only the (c)(4) issues for which the Court found commonality above--common questions predominate. Taking note of the factors relevant to the 23(b)(3) analysis, the Court finds that (A) the putative class members do not have a strong interest in controlling the litigation with respect to the issues on which plaintiffs seek certification; on the contrary, given the need for extensive expert testimony, resolving these issues in a single proceeding would seem to benefit the class members; (B) no other class action against DaVita regarding its use of GranuFlo has been requested, see Day One Tr. at 92; and (C) DaVita's principal place of business is Denver, Colorado, and thus this Court is an appropriate forum in which to resolve this dispute, ECF No. 90 at ¶ 28.

         The fourth consideration--the likely difficulties in managing a class action--cuts against certification, as discussed below, even when considered only with respect to the particular issues on which plaintiffs seek certification. However, the Court believes that these concerns about the manageability of plaintiffs' proposed class are best addressed under the superiority analysis below. See Johnston v. HBO Film Mgmt., Inc., 265 F.3d 178, 194 (3d Cir. 2001) (" It is within [the superiority] requirement that the court should address the difficulties likely to be encountered in the management of a class action." ).

         Moreover, an important focus of the predominance inquiry is whether plaintiffs can establish that " the issues in the class action that are subject to generalized proof, and thus applicable to the class as a whole, predominate over those issues that are subject only to individualized proof." In re Nassau Cnty. Strip Search Cases, 461 F.3d at 227 (internal citation omitted). The 11 issues for which the Court found commonality above--involving GranuFlo's effect on bicarbonate levels, DaVita's monitoring of patient data, DaVita's company-wide practices and procedures, DaVita's knowledge about problems associated with the use of GranuFlo, whether DaVita concealed information from its patient population, DaVita's duties as a corporation, and whether DaVita committed an unfair or deceptive trade practice--all turn on generalized proof about the nature of GranuFlo and DaVita's actions as a corporation. Although DaVita highlights a host of issues requiring individualized proof that are relevant to plaintiffs' claims, these individual issues are of limited relevance here, where Court has determined it will look only to whether predominance is satisfied as to the particular issues on which plaintiffs seek certification.

         Thus the most relevant considerations weigh in favor of finding predominance here. Courts have recognized that Rule 23(c)(4) effectively operates to isolate just those issues that predominate: " Even if the common questions do not predominate over the individual questions so that class certification of the entire action is warranted, Rule 23 authorizes the district court in appropriate cases to isolate the common issues under [Rule 23(c)(4)] and proceed with class treatment of these particular issues." Valentino v. Carter-Wallace, Inc., 97 F.3d 1227, 1234 (9th Cir. 1996). See also Simon v. Philip Morris Inc., 200 F.R.D. 21, 29-30 (E.D.N.Y. 2001) (" The framers of [Rule 23(c)(4)] considered class actions brought under Rule 23(b)(3)--characteristically disputes that involve numerous individual proofs of causation and injury--particularly well suited for certification of fewer than all issues. Their conclusion follows from the fact that [Rule 23(c)(4)] assists in satisfying Rule 23(b)(3)'s additional class certification requirements of predominance and superiority." ). In sum, plaintiffs have employed Rule 23(c)(4) to isolate those issues that predominate over individual ones and can be resolved with reference to generalized proof. The Court accordingly concludes that plaintiffs have satisfied Rule 23(b)(3)'s predominance requirement.

         2. Superiority

         Rule 23(b)(3) also requires that a class action is " superior to other available methods for fairly and efficiently adjudicating the controversy." The Tenth Circuit has noted that " class treatment is superior [when] it will achieve economies of time, effort, and expense, and promote uniformity of decision as to persons similarly situated, without sacrificing procedural fairness or bringing about other undesirable results." CGC Holding Co., LLC v. Hutchens, 773 F.3d 1076, 1096 (10th Cir. 2014) (quoting Amchem Products, Inc. v. Windsor, 521 U.S. 591, 615, 117 S.Ct. 2231, 138 L.Ed.2d 689 (1997)). See also Zinser v. Accufix Research Inst., Inc., 253 F.3d 1180, 1192 (9th Cir.) opinion amended on denial of reh'g, 273 F.3d 1266 (9th Cir. 2001) (" If each class member has to litigate numerous and substantial separate issues to establish his or her right to recover individually, a class action is not 'superior.'" ). Furthermore, " a class action is the superior method for managing litigation if no realistic alternative exists." Valentino v. Carter-Wallace, Inc., 97 F.3d 1227, 1234-35 (9th Cir. 1996).

         In the present case, although the first three 23(b)(3) factors weigh in favor of certification, several manageability concerns present here overwhelm the superiority analysis. See Johnston, 265 F.3d at 194 (noting that manageability concerns are particularly relevant to superiority). Setting aside the claim asserted under the Colorado Consumer Protection Act for a minute, the core claims in this case are that DaVita was either negligent in monitoring patient data and thus failed to recognize the risks associated with its use of GranuFlo, or that DaVita did properly monitor the relevant data and understand its significance but concealed it from its patients and their physicians. On either theory, although the general issues on which plaintiffs seek certification are relevant to each putative member's potential claims, a myriad of individual causation issues would need to be resolved with respect to each plaintiff.

         Even in the discussion of the three named plaintiffs at the class certification hearing, the defendant put forth expert testimony that (1) Mrs. Nunes' bicarbonate level was not elevated to a dangerous level when she suffered cardiac arrest, and, even if it had been, that could not have been caused by GranuFlo because she was only five minutes into her dialysis treatment that day, Day Two Tr. at 382-85; (2) Mr. Armstrong had been admitted to the hospital several times because he " was not adherent to his dialysis treatments," he had engaged in illicit drug use, he had a history of hypertension and congestive heart failure, and, on the day of his cardiac arrest, he experienced " fluid overload" after drinking one liter of Coca-Cola and did not have a dangerously high bicarbonate level, id. at 390-94; and, lastly, (3) Ms. Morris had a history of cardiovascular problems, and, although her bicarbonate level was unusually high at the time she was admitted to the hospital, this was caused by her vomiting on the way to the hospital, not her dialysis treatment, id. at 394-97. If the Court were to certify the plaintiffs' proposed 23(b)(3) class, it would potentially need to hold several thousand mini-trials to resolve individual causation issues for the putative members who suffered a negative health outcome.

         In sum, this is a case in which individual issues are so central to plaintiffs' claims that classwide treatment of even the issues on which plaintiffs seek certification would not achieve significant economies of time, effort, and expense.

         Furthermore, the different laws that govern putative members' claims and the significant individual causation issues involved make class treatment unworkable. As this Court has already made clear in its Orders on DaVita's motions to dismiss [ECF Nos. 69 and 126], each putative class member's claims are governed by the laws of the state in which he or she received treatment at a DaVita clinic. Thus, under plaintiffs' plan, after the initial phase of litigation, the Court and the parties would be faced with the task of sorting out how to proceed under dozens of states' laws, which are far from uniform in the medical malpractice context. In light of the individual causation issues and the variety of state laws involved in plaintiffs' claims, the Court concludes that class treatment is not a superior method for resolving plaintiffs' negligence and fraudulent concealment claims.

         Turning to the consumer protection claims, the Court here too finds that plaintiffs' proposed class is unmanageable. The complaint sets out a claim under the Colorado Consumer Protection Act. ECF No. 90 at 37. However, it is not clear to the Court that out-of-state plaintiffs who received treatment from DaVita clinics in their home states and presumably also saw any advertising (or did not receive any information that should have been disclosed) in their homes states can bring suit under Colorado's consumer protection statute. Indeed, the choice-of-law analysis for consumer protection claims takes into account the same considerations as that for plaintiffs' negligence and fraud claims, and thus the Court concludes that the relevant law of each plaintiff's home state governs any consumer protection claim he or she might bring. See note 14, supra. See also Elvig v. Nintendo of Am., Inc., 696 F.Supp.2d 1207, 1215 (D. Colo. 2010) (" It is reasonable to assume that most consumers expect to be protected by the laws applicable in the state where they live, purchase a product and use it." ); In re Pharm. Indus. Average Wholesale Price Litig., 230 F.R.D. 61, 83 (D. Mass. 2005) (finding that the consumer protection law of each plaintiff's home state applied where " class members purchased physician-administered drugs in reliance on [publications] in states where they were receiving treatments from their physicians, typically their places of residence" ). Again here, the Court and the parties would be forced to sort out putative class members' claims under dozens of state consumer protection laws, which vary widely. Such an approach is not superior.

         Moreover, at least portions of plaintiffs' alleged consumer protection claims would require a consideration of individualized proof. Even assuming that Colorado law applied, " to maintain a private claim for relief [under the CCPA], a plaintiff must demonstrate an injury in fact to a legally protected interest caused by the challenged deceptive trade practice." Crowe v. Tull, 126 P.3d 196, 209 (Colo. 2006). The Colorado Supreme Court addressed the issue of whether plaintiffs can establish the causation element of a CCPA claim on a classwide basis, without consideration of individual evidence, in Garcia v. Medved Chevrolet, Inc., 263 P.3d 92 (Colo. 2011). In that case, the court noted that " [r]eliance often provides a key causal link between a consumer's injury and a defendant's deceptive practice." Id. at 98. Although " reliance may be inferred from circumstantial evidence common to a class," frequently " proof of reliance varies from individual to individual." Id. at 98-99. Indeed, " courts have . . . refused to certify class actions where an individual assessment is required to determine whether a class member relied on a defendant's deceptive practice and whether that practice caused injury." Id. at 99. Trial courts must, therefore, " rigorously analyze the evidence presented to determine whether the evidence supports a class-wide inference of causation. As part of this analysis, the trial court must consider not only whether the circumstantial evidence common to the class supports an inference of causation, but also whether any individual evidence refutes such an inference." Id. at 100.

         In the present case, plaintiffs allege that DaVita violated the CCPA by (1) failing to disclose " true and material facts concerning NaturaLyte and GranuFlo and its use of those products in administering dialysis treatments," and (2) making false statements about the high quality of care it provided to patients. ECF No. 90 at ¶ ¶ 42-44, 107. To the extent plaintiffs' CCPA claim is based on DaVita's failure to disclose particular information, it is likely susceptible to proof on a classwide basis; plaintiffs can argue that no reasonable class member would have sought treatment from DaVita had the alleged risks associated with its use of GranuFlo been disclosed. See Garcia, 263 P.3d at 99 (citing Negrete v. Allianz Life Insurance of North America, 238 F.R.D. 482, 484 (C.D. Cal. 2006) (plaintiffs could establish reliance on a classwide basis with the " common sense inference that no rational class member would purchase the annuities in questions [sic] upon adequate disclosure of the facts" )).

         However, to the extent the claim is grounded in DaVita's affirmative statements about its quality of care and high regard for patient safety, plaintiffs will likely be required to present individualized proof of reliance. At this stage, plaintiffs have failed to present evidence common to the proposed class that supports an inference of causation, and, moreover, DaVita intends to present evidence refuting reliance on an individual basis (indeed, as far as the Court is aware, it is possible if not probable that putative class members were directed to DaVita clinics by their nephrologists and investigated DaVita no further). For these reasons, at least a portion of plaintiffs' CCPA claim is not amenable to classwide treatment. Thus resolution of the issues on which plaintiffs seek certification would do little to secure economies of time, effort, and expense; the nature of plaintiffs' consumer protection claim underscores the above finding that class treatment is not superior.

         The Court also notes that a realistic alternative to class treatment exists here for all of plaintiffs' claims. The three plaintiffs presently before the Court allege that they have suffered serious injuries; they thus have every incentive to pursue their claims against DaVita. Moreover, the Court thinks it likely that other potential plaintiffs will be able to rely on collateral estoppel to avoid relitigating the general causation issues on which plaintiffs seek certification in the event that the initial plaintiffs are successful (indeed, this set-up benefits plaintiffs at the expense of the defendant, which cannot rely on collateral estoppel even after successfully litigating against one or more plaintiffs). See Gunnells v. Healthplan Servs., Inc., 348 F.3d 417, 427 (4th Cir. 2003) (noting that plaintiffs can rely on collateral estoppel against a defendant when another plaintiff has prevailed on an issue that the defendant has had a full and fair opportunity to litigate). See also Mulford v. Altria Grp., Inc., 242 F.R.D. 615, 631 (D.N.M. 2007) (finding class treatment not superior in part because plaintiffs in later individual cases could rely on collateral estoppel to prevent defendants from raising the same issues in subsequent litigations). Thus, in the present action, individual cases provide a realistic alternative to a class action.

         Lastly, other expenses and undesirable results would result from class certification in the present case. As mentioned in the ascertainability analysis above, the process the parties have outlined for determining who is a member of the putative class--on any of the plaintiffs' proposed definitions--would be complex, costly, and not necessarily entirely accurate. Moreover, any notice sent to the proposed class of 300,000 individuals would potentially alarm many of them and lead them to question their confidence in DaVita, when in fact that vast majority of these people did not experience any adverse health effects as a result of DaVita's use of GranuFlo. See note 8, supra. Thus the expense associated with attempting to identify class members and the undesirable result of unnecessarily alarming many thousands of sick people further underscore the conclusion that class treatment is not superior here.

         To sum up, plaintiffs' claims require the application of dozens of states' negligence, fraud, and consumer protection laws and involve a host of issues necessitating individualized proof. In light of these considerations, the Court finds that class treatment in the present case will not achieve economies of time, effort, and expense and a class action is therefore not a superior method for resolving this dispute. For this reason, I decline to certify plaintiffs' proposed 23(b)(3) class.

         3. Materially Advancing the Litigation

         Finally, " [c]ourts should use Rule 23(c)(4) . . . only where resolution of the particular common issues would materially advance the disposition of the litigation as a whole." In re Motor Fuel Temperature Sales Practices Litig., 292 F.R.D. at 665 (internal citation and quotations omitted). See also In re Paxil Litig., 212 F.R.D. 539, 543 (C.D. Cal. 2003) (" Since the purpose of Rule 23(c)(4) is to give courts the discretion necessary to advance judicial economy, courts have refused to apply Rule 23(c)(4) when such application would not significantly advance the litigation." ). For much the same reasons that class treatment is not superior in the present circumstances, the Court also finds that certification under Rule 23(c)(4) would do relatively little to advance the disposition of this litigation. As explained above, the necessity of applying the law of each plaintiff's home state and the extent to which plaintiffs' claims turn on individual issues make class treatment unworkable. For these same reasons, resolution of the issues on which plaintiffs seek certification would play only a limited role in the resolution of their claims on the whole. Even considering just the smaller, alternative proposed class of the 3,000 to 6,000 individuals who suffered a cardiac event or stroke, this case is one that necessarily involves highly individualized inquiries about the chain of causation leading to a significant negative health event; such inquiries are best conducted in individual trials, not a class action involving thousands of plaintiffs. Thus, in addition to the fact that class treatment is not superior, 23(c)(4) certification would not materially advance the disposition of this litigation as a whole.

         III. Conclusion

         For the reasons set forth above, Plaintiffs' Motion to Certify Class and Appoint Class Counsel [ECF No. 99/100] is DENIED.