| RPI | Reticulocyte Production Index |
|---|---|
| AAI | acute alveolar injury; Adolescent Alienation Index; American Association of Immunologists; atrial in... |
| ABI | ankle/brachial index; atherothrombotic brain infarct |
| ACH | acetylcholine; achalasia; active chronic hepatitis; adrenocortical hormone; amyotrophic cerebellar h... |
| AIM | Abridged Index Medicus; acute transverse myelopathy; area of interest magnification; artificial inte... |