| CRM | Certified Reference Materials; counting rate meter; cross-reacting material; crown-rump measurement |
|---|---|
| CRNA | Certified Registered Nurse Anesthetist |
| CRRN | certified rehabilitation registered nurse |
| CRTT | Certified Respiratory Therapy Technician |
| CS(NCA) | Clinical Laboratory Scientist Certified by the National Certification Agency for Medical Laboratory ... |