| IRS | ImmunoReactive Score |
|---|---|
| IRS | Immunoreactive somatostatin |
| IRs | Immunoreactivities |
| IRS | Insulin Receptor Substrate |
| IRS | Insulin Resistance Syndrome |
| IRS | Inter-group Rhabdomyosarcoma Study |
| IRS | Internal Revenue Service |
| IRS | inflammatory response system |
| IRS | inner root sheath |
| IRS | insulin response sequence |