| API | alkaline protease inhibitor; Analytical Profile Index; arterial pressure index; atmospheric pressure... |
|---|---|
| AR | absolute risk; accounts receivable; achievement ratio; actinic reticuloid [syndrome]; active resista... |
| ORANS | Oak Ridge Analytical System |
| ISI | International Sensitivity Index of reagent/instrument combination |
| AST | allergy serum transfer; angiotensin sensitivity test; anterior spinothalamic tract; antistreptolysin... |