| Isata | spatial average, temporal average intensity [pulse] |
|---|---|
| ISB | incentive spirometry breathing |
| ISBI | International Society for Burn Injuries |
| ISBP | International Society for Biochemical Pharmacology |
| ISBT | International Society for Blood Transfusion |
| ISC | immunoglobulin-secreting cells; insoluble collagen; International Society of Cardiology; International Society of Chemotherapy; intensive supportive care; intershift coordination; interstitial cell; irreversibly sickled cell |
| ISCF | interstitial cell fluid |
| ISCLT | International Society for Clinical Laboratory Technology |
| ISCM | International Society of Cybernetic Medicine |
| ISCN | International System for Human Cytogenetic Nomenclature |