| AISA | Acquired Idiopathic Sideroblastic Anemia = RARS |
|---|---|
| AAA | abdominal aortic aneurysm/aneurysmectomy; acne-associated arthritis; acquired aplastic anemia; acute... |
| ABBQ | Acquired Immunodeficiency Syndrome Beliefs and Behavior Questionnaire |
| ACKD | acquired cystic kidney disease |
| ACU | acquired cold urticaria; acute care unit; agar colony-forming unit; ambulatory care unit |