| Acronym | Meaning |
 | PID | Pelvic Inflammatory Disease |
| PM | ParaMedic |
| PMHX | Prior/Previous Medical History |
| PMI | Point Of Maximal Impulse |
| PMS | Peripheral Motor (nervous) System |
| PNB | Pulseless Not Breathing |
| PND | Paroxysmal Nocturnal Dyspnea |
| PNH | Paroxysmal Nocturnal Hemoglobinuria |
| PNS | Peripheral Nervous System |
| PO | By Mouth / Per Oral |
| PO | By Mouth |
| PO2 | Partial Pressure Of O2 |
| POTS | POSTURAL ORTHOSTATIC TACHYCARDIA SYNDROME |
| PPV | Positive Pressure Ventilation |
| PR | Per Rectum |
| PRBC | Packed Red Blood Cells |
| PRN | (pro Re Nata) AS NEEDED |
| PS | Pyloric Stenosis |
| PSA | Prostate Specific Antigen |
| PSA | Prostate Check |
| PSVT | Paroxysmal Supra-Ventricular Tachycardia |
| PT | Prothrombin Time |
| PTCA | Percutaneous Transluminal Coronary Angioplasty |
| PTT | Partial Thromboplastin Time |
| PUD | Peptic Ulcer Disease |
| PVD | Peripheral Vascular Disease |
| PWB | PARTIAL WEIGHT BEARING |
| PX | Pneumothorax |
| QD | Everyday |
| QD | Everyday |
| QID | Four Times A Day |
| QNS | Quantity Not Sufficient |
| QOD | Every Other Day |
| QS | Quantity Sufficient |
| RA | Rheumatoid Arthritis |
| RA | Rheumatoid Arthritis |
| RAD | Reactive Airway Disease |
| RAI | Radioactive Iodine |
| RAIU | Radioactive Iodine Uptake |
| RCA | Right Coronary Artery |
| RDW | Red Cell Distribution Width |
| REEDA | Redness |
| RHD | Rheumatic Heart Disease |
| RIJ | Right Internal Jugular |
| RLQ | Right Lower Quadrant |
| RM | Respiratory Movement |
| RM | Respiratory Movement |
| ROM | Range Of Motion |
| ROS | Review Of Systems |
| RSC | Right Subclavian |
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