| PGP | Poor prognostic group |
| PgR | Progesteronrezeptor |
| PGS | Polyglykolsäure (Nahtmaterial) |
| PGV | proximal gastrische Vagotomie |
| pH | pondus Hydrogenii |
| PH | Pulmonale Hypertonie |
| PH1 | Phlidelphiachromosom |
| Phe | Phenylalanin |
| PHI | Phosphohexoseisomerase |
| PHLA | post-Heparin-lipolytische Aktivität |
| pHPT | primärer Hyperparathyreoidismus |
| PHS | Periarthritis humero-scapularis |
| p.i. | per inhalationem |
| PI | Proteaseinhibitoren |
| PID | Präimplantationsdiagnostik |
| PIF | prolactin inhibiting factor |
| PIH | prolactin inhibiting hormone |
| PIH | pregnancy induced hypertension |
| PIN | Penile intraepitheliale Neoplasia |
| PIP | prox. Interphalangealgelenk |
| PIV | Zytostase mit Cisplatin, Ifosfamid, Vinblastin |
| PIVKA | Prothrombin induced in Vitamin-K-abscence (funktionslos) |
| PJS-Reaktion | PAS-Reaktion |
| PK | Primärkomplex |
| PK | Pyruvatkinase |
| PKG | Phonokardiogramm |
| PKHD | Polycystic Kidney and Hepatic Disease |
| PKV | private Krankenversicherung |
| Pl. | Plexus |
| PLAP | plazentare alkalische Phosphatase |