| APA |
action potential amplitude; aldosterone-producing adenoma; Ambulatory Pediatric Association; American Pancreatic Association; American Pharmaceutic Association; American Physiotherapy Association; American Podiatric Association; American Psychiatric Association; American Psychoanalytic Association; American Psychological Association; American Psychopathological Association; American Psychotherapy Association; aminopenicillanic acid; anterior margin of pulmonary artery; antipernicious anemia [factor]; antiphospholipid antibody; antiproliferative antibody; arcuate premotor area |
| APAAP |
alkaline phosphatase-antialkaline phosphatase [labeling] |
| APAB |
antiphospholipid antibody |
| APACHE |
Acute Physiology and Chronic Health Evaluation [severity-of-illness index] |
| APAF |
antipernicious anemia factor |
| APAP |
acetaminophen |
