| IF | Isoelectric focusing |
|---|---|
| IF | interstitial fibrosis |
| IF gamma | interferon gamma |
| IF-2 | Initiation factor 2 |
| IF-3 | Initiation factor 3 |
| IFA | Immuno fluorescent Antibody |
| IFA | Immuno-fluorescent assay |
| IFA | Immunofluorescence |
| IFA | Immunofluorescence Antibody |
| IFA | Immunofluorescent Antibody Assay |