| P-5'-N | pyridine-5'-nucleosidase |
|---|---|
| P-5'-P | pyridoxal-5'-phosphate |
| P-50 | oxygen half-saturation pressure |
| P-A | posteroanterior |
| P-ANCA | perinuclear anti-neutrophilic cytoplasmic antibody |
| P-COM | Posterior COMmunicating artery |
| P-diol | pregnanediol |
| P-F | picture-frustration [test] |
| p-HPPO | p-hydroxyphenyl pyruvate oxidase |
| P-J syndrome | Peutz-Jeghers syndrome |