| IGS | image-guided surgery; inappropriate gonadotropin secretion; internal guide sequence |
|---|---|
| IRS | immunoreactive secretion; infrared spectrophotometry; insulin receptor species; insulin receptor sub... |
| IS | ileal segment; immediate sensitivity; immune serum; immunosuppression; impingement syndrome; incenti... |
| ISADH | inappropriate secretion of antidiuretic hormone |
| ISR | information storage and retrieval; Institute for Sex Research; Institute of Surgical Research; insul... |