| ICRU | International Commission on Radiation Units and Measurements |
|---|---|
| IU/l | international units per liter |
| IU/min | international units per minute |
| SI | International System of Units [Fr. le Systeme International d'Unites]; sacroiliac; saline infusion; ... |
| SRU | sample ratio units; side rails up; solitary rectal ulcer; structural repeating unit |