| IART | Intra-atrial reentrant tachycardia |
|---|---|
| IAS | Illness Attitude Scale |
| IAS | Insulin autoimmune syndrome |
| IAS | Internal anal sphincter |
| IAS | interatrial septum |
| IASP | International Association for the Study of Pain |
| IAT | Implicit Association Test |
| IAT | Intracarotid amobarbital test |
| IAT | Intraoperative Autotransfusion |
| IAT | indirect antiglobulin test |