| APE | acetone powder extract; acute polioencephalitis; acute psychotic episode; airway pressure excursion;... |
|---|---|
| APH | alcohol-positive history; alternative pathway hemolysis; aminoglycoside phosphotransferase; antepart... |
| APR | abdominoperineal resection; absolute proximal reabsorption; acute phase reaction or reactant; amebic... |
| AR | absolute risk; accounts receivable; achievement ratio; actinic reticuloid [syndrome]; active resista... |
| ARAO | angiographic area of right anterior oblique projection |