D.C. Mun. Regs. tit. 17, r. 17-7604
In addition to satisfying the educational requirement set forth in § 7602, an applicant shall receive a passing score on the Therapist Multiple-Choice Examination for Certified Respiratory Therapist (CRT) or for Registered Respiratory Therapist (RRT), developed and administered by the National Board for Respiratory Care (NBRC). The passing score for the purposes of these rules shall be the passing score determined by the NBRC.
Each applicant for a license by examination shall submit to the Board a completed application and the applicant's CRT or RRT examination results, which shall be certified or validated by the NBRC.
An applicant for a license by examination who took and passed an NBRC examination required pursuant to § 7604.1 more than five (5) years prior to the date of the application shall be required to take and pass the examination again unless the applicant has continuously maintained valid credential as a Certified Respiratory Therapist (CRT) or Registered Respiratory Therapist (RRT) and such credential was obtained after July 1, 2002.
D.C. Mun. Regs. tit. 17, r. 17-7604