| OET | oral endotracheal tube; oral esophageal tube |
|---|---|
| OHI | Occupational Health Institute; operative hypertension indicator; oral hygiene index; Oral Hygiene In... |
| C&DB | cough and deep breath |
| CF | calcaneal fibular [ligament]; calcium leucovorin; calf blood flow; calibration factor; cancer-free; ... |
| CT | calcitonin; calf testis; cardiac tamponade; cardiothoracic [ratio]; carotid tracing; carpal tunnel; ... |