| IFSP | individualized family service plan |
|---|---|
| IHS | idiopathic hypereosinophilic syndrome; inactivated horse serum; Indian Health Service; integrated he... |
| IRIS | integrated risk information system; interleukin regulation of immune system; International Research ... |
| IS | ileal segment; immediate sensitivity; immune serum; immunosuppression; impingement syndrome; incenti... |
| ISN | integrated service network; International Society of Nephrology; International Society of Neurochemi... |