CRT and RRT are designations issued to you by the National Board of Respiratory Care. This credential was required by many employers prior to licensure to recognize that you had the competence to practice as a respiratory therapist. CRT is the entry level designation and RRT is the advanced respiratory therapist designation. You can use these certifications after your licensed initials to denote the level of training and competency that you have achieved, if you choose to do so or if your employer requires you to do so.

Other specialty certifications can also be used but should appear after the license initials such as CPFT (Certified Pulmonary Function Technologist) and RFPT (Advanced Pulmonary Function Technologist).

For example:

John Smith, LRT

Jane Williams, LRT, RRT

Sam Johnson, LRT, CRT

Susan Thomas, LRT, CPFT