| Abbreviation | Definition |
|---|---|
| P | Perception |
| P | Pinky |
| P | Post |
| P | Premature |
| P | Progressive |
| P&A | Percussion and Auscultation |
| P02 | Partial pressure of Oxygen |
| P45 | Pneumonoultramicroscopicsilicovolcanoconiosis |
| PA | Passive Aggressive |
| PA | Pernicious Anemia |
| PA | Physician Assistant |
| PA | Physician Assistants |
| PA | Physician's Assistant |
| PA | Posterior Anterior |
| PA | Psoriatic Arthritis |
| PA | Pulmonary Artery |
| P-A | Posterior Anterior |
| PAAN | Physician Assistant AIDS Network |
| PABA | Para AminoBenzoic Acid |
| PAC | Premature Atrial Contraction |