| PABA | Para-Aminobenzoic Acid | - | Medical(slang) |
| PABA | Para-aminobenzoic Acid | - | Medical(slang) |
| PAD | Peripheral Arterial Disease | - | Medical(slang) |
| PC | After Meals | - | Medical(slang) |
| PCA | Patient Controlled Analgesia | - | Medical(slang) |
| PCN | Penicillin | - | Medical(slang) |
| PCV | Packed Cell Volume | - | Medical(slang) |
| PD | Peritoneal Dialysis | - | Medical(slang) |
| PDA | Patent Ductus Arteriosus | - | Medical(slang) |
| PDD | Pervasive Development Disorder | - | Medical(slang) |
| PDR | Physician's Desk Reference | - | Medical(slang) |
| PE | Pulmonary Edema / Embolism | - | Medical(slang) |
| PEG | Percutaneous Endoscopic Gastrostomy | - | Medical(slang) |
| PEG | Percutaneous Endoscopic Gastrostomy | - | Medical(slang) |
| PEJ | Percutaneous Endoscopic Jejunostomy | - | Medical(slang) |
| PERL | Pupils Equal, Round, Reactive To Light | - | Medical(slang) |
| PERRLA | Pupils Equal, Round, Reactive To Light And Accommodation | - | Medical(slang) |
| PET | Positron Emission Tomography | - | Medical(slang) |
| PFT | Pulmonary Function Test | - | Medical(slang) |
| PG | Prostaglandin | - | Medical(slang) |
| PH | Past History | - | Medical(slang) |
| PH | Concentration Of Hydrogen Ions | - | Medical(slang) |
| PH.D. | Doctorate Of Philosophy | - | Medical(slang) |
| PI | Present Illness | - | Medical(slang) |
| PI | Present Illness | - | Medical(slang) |
| PICC | Peripherally Inserted Central Venous Catheter | - | Medical(slang) |
| PID | Pelvic Inflammatory Disease | - | Medical(slang) |
| PM | ParaMedic | - | Medical(slang) |
| PMHX | Prior/Previous Medical History | - | Medical(slang) |
| PMI | Point Of Maximal Impulse | - | Medical(slang) |
| PMS | Peripheral Motor (nervous) System | - | Medical(slang) |
| PNB | Pulseless Not Breathing | - | Medical(slang) |
| PND | Paroxysmal Nocturnal Dyspnea | - | Medical(slang) |
| PNH | Paroxysmal Nocturnal Hemoglobinuria | - | Medical(slang) |
| PNS | Peripheral Nervous System | - | Medical(slang) |
| PO | By Mouth / Per Oral | - | Medical(slang) |
| PO | By Mouth | - | Medical(slang) |
| PO2 | Partial Pressure Of O2 | - | Medical(slang) |
| POTS | POSTURAL ORTHOSTATIC TACHYCARDIA SYNDROME | - | Medical(slang) |
| PPV | Positive Pressure Ventilation | - | Medical(slang) |
| PR | Per Rectum | - | Medical(slang) |
| PRBC | Packed Red Blood Cells | - | Medical(slang) |
| PRN | (pro Re Nata) AS NEEDED | - | Medical(slang) |
| PS | Pyloric Stenosis | - | Medical(slang) |
| PSA | Prostate Specific Antigen | - | Medical(slang) |
| PSA | Prostate Check | - | Medical(slang) |
| PSVT | Paroxysmal Supra-Ventricular Tachycardia | - | Medical(slang) |
| PT | Prothrombin Time | - | Medical(slang) |
| PTCA | Percutaneous Transluminal Coronary Angioplasty | - | Medical(slang) |
| PTT | Partial Thromboplastin Time | - | Medical(slang) |
| PUD | Peptic Ulcer Disease | - | Medical(slang) |
| PVD | Peripheral Vascular Disease | - | Medical(slang) |
| PWB | PARTIAL WEIGHT BEARING | - | Medical(slang) |
| PX | Pneumothorax | - | Medical(slang) |
