C
| c | with |
| C&S | Culture and sensitivity |
| c/o | Complains of, complaints |
| C1, C2, and so on |
First cervical vertebra, second and so on cervical vertebra, and so on |
| CA | Cancer; Chronological age; Cardiac arrest |
| Ca | Calcium; Cancer |
| CABG | Coronary artery bypass graft |
| CAD | Coronary artery disease |
| CAH | Chronic active hepatitis; congenital adrenal hyperplasia |
| CAT | Computed axial tomography |
| Cath | Catheterization; catheter |
| CBC | Complete blood count |
| CC | Cardiac catheterization; chief complaint |
| cc* | Cubic centimeters; same as mL (1/1000 of a liter) |
| CCU | Coronary care unit |
| CDH | Congenital dislocation of the hip |
| CF | Cystic fibrosis |
| CHD | Coronary heart disease chemo chemotherapy |
| CHF | Congestive heart failure |
| Chol | Cholesterol |
| CIS | Carcinoma in situ |
| CK | Creatine kinase (cardiac enzyme); conductive keratoplasty |
| CLL | Chronic lymphocytic leukemia |
| cm | Centimeter (1/100 of a meter) |
| CML | Chronic myelogenous leukemia |
| CNS | Central nervous system |
| CO | Coccygeal nerves |
| c/o | Complains of |
| CO2 | Carbon dioxide |
| COLD | Chronic obstructive lung disease |
| COPD | Chronic obstructive pulmonary disease |
| CP | Cerebral palsy |
| CPAP | Continuous positive airway pressure |
| CPD | Cephalopelvic disproportion |
| CPK | Creatine phosphokinase (enzyme released into bloodstream after a heart attack) |
| CPR | Cardiopulmonary resuscitation |
| CRF | Chronic renal failure |
| CRRT | Continuous renal replacement therapy |
| CS, C-section | Cesarean section |
| CSF | Cerebrospinal fluid |
| CT | Computed tomography |
| CTS | Carpal tunnel syndrome |
| CV | Cardiovascular |
| CVA | Cerebrovascular accident |
| CVD | Cardiovascular disease |
| CVS | Chorionic villus sampling |
| CWP | Childbirth without pain |
| CXR | Chest x-ray, chest radiograph |
| cysto | Cystoscopy |
