| IOTA | information overload testing aid |
|---|---|
| IPAT | Institute of Personality and Ability Testing; Iowa Pressure Articulation Test |
| ISTU | isometric strength testing unit |
| ITC | imidazolyl-thioguanine chemotherapy; Interagency Testing Committee; in the canal [hearing aid] |
| MHTS | Multiphasic Health Testing Services |