| Abbreviation | Term(s) |
| P | Pulse |
| P&A | Percussion and auscultation |
| PA | Posteroanterior |
| PA | Pulmonary artery |
| PALP | Palpable, palpated, palpation |
| PAP | Papanicolaou smear |
| PAP | Papillary |
| PAR | Post anesthesia room |
| PARA | Number of pregnancies resulting in viable infants |
| PATH | Pathology |
| PCV | Packed cell volume |
| PD | Poorly differentiated |
| PDR | Physicians' Desk Reference |
| PE | Physical examination |
| PED | Pediatrics |
| PEG | Pneumoencephalography |
| PH | Past or personal tomography |
| PH | Past or personal history |
| PI | Present illness |
| PID | Pelvic inflammatory disease |
| PLT | Platelets |
| PM | Post mortem (after death) |
| PMD | Personal (primary) medical doctor |
| PMH | Past medical history |
| PND | Postnasal drip |
| PO, POSTOP | postoperative(ly) |
| POD | Postoperative day |
| POOR DIFF | poorly differentiated |
| POS or + | Positive |
| POSS | Possible |
| POST | Posterior |
| POST | Postmortem examination |
| POSTOP | Postoperative(ly) |
| PPD | Purified protein derivative (Tuberculin skin test) |
| PPD | Packs per day |
| PR(A) | Progesterone receptor (assay) |
| PREOP | Preopeartive(ly) |
| PROB | Probably(ly) |
| PSA | Prostatic Specific Antigen |
| PT | Patient |
| PT | Physiotherapy |
| PTA | Prior to admission |
| PUO | Pyrexia of undermined origin |
| PULM | Pulmonary |