| A | B |
| CHO | carbohydrate |
| chol | cholesterol |
| CICU | cardiac intensive care unit |
| ck | check |
| Cl | chloride or chlorine |
| cl liq | clear liquids |
| cm | centimeter |
| CMA | certified medical assistant |
| CNP | certified nurse practitioner |
| CNS | central nervous system |
| co, c/o | complains of |
| CO | carbon monoxide, coronary occlusion |
| CO2 | carbon dioxide |
| Comp | complete, compound |
| cont | continued |
| COPD | chronic obstructive pulmonary disease |
| COTA | certified occupational therapy assistant |
| CP | cerebral palsy |
| CPK | creatine phosphokinase (cardiac enzyme) |
| CPR | cardiopulmonary resuscitation |
| difficulty breathing | dyspnea |
| breathing too fast | tachypnea |
| breathing too slow | bradypnea |
| pnea | refers to breathing |
| chronic | condition where sxs start out gradually, prgress and worsen, and no cure |
| acute | condition where sxs start suddenly, are severe and with treatment usually subside or go away |
| CPAP | continuous positive airway pressure |