| COP | Cryptogene Organisierende Pneumonie |
| COPD | cronic obstructive pulmonary disease |
| COPP | Zytostase mit Cyclophosphamid, Vincristin (=Oncovin), Procarbazin, Prednisolon bei Hodgkin Lymphomen |
| Coro | Koronarangiographie |
| cP | chronische Polyarthritis |
| CP | Constrictive Pericarditis |
| CP | Cor pulmonale |
| CPA | Cyproteronazetat |
| CPAA | Colonpouch-anale Anastomose |
| CPAP | continuous positive airway pressure |
| CPE | cytopathic effect |
| CPH | chronisch persistierende Hepatitis |
| CPK | Carotis Pulskurve |
| CPK | Creatininphosphokinase (=CK) |
| cpm | counts/ minute |
| CPM | Continuous-Passive-Motion |
| CPP | Cerebral Perfusion Pressure |
| CPPV | continuous positive pressure ventilation |
| CPR | Cardiopulmonale Reanimation |
| cps | counts/ second |
| c-PSA | komplexiertes PSA |
| CPT | Carboplatin (Irinotecan =Zytostatikum) |
| CP-Test | Cold pressure Test |
| CR | komplette Remission |
| CR | Cremasterreflex |
| CR | konditionierte Reaktion |
| cRABP | cellular Retinoic Acid Binding Protein |
| CRC | colorectal cancer |
| CREST | Kollagenose |
| CRF | cardiale Risikofaktoren |