| FUT | fibrinogen uptake test; fucosyl transferase |
|---|---|
| GU | gastric ulcer; genitourinary; glucose uptake; glycogenic unit; gonococcal urethritis; gravitational ... |
| I-131 | iodine-131 |
| IAR | immediate asthma reaction; inhibitory anal reflex; iodine-azide reaction |
| IAT | instillation abortion time; iodine azide test; invasive activity test |