| APE | acetone powder extract; acute polioencephalitis; acute psychotic episode; airway pressure excursion;... |
|---|---|
| ARD | absolute reaction of degeneration; acute radiation disease; acute respiratory disease; adult respira... |
| ARN | acute renal necrosis; acute retinal necrosis; arcuate nucleus; Association of Rehabilitation Nurses |
| ASS | acute serum sickness; acute spinal stenosis; anterior superior spine; argininosuccinate synthetase |
| ATLL | Adult T cell Leukemia/Lymphoma |