| Abbreviation | Definition |
|---|---|
| IDGL | Independent Diamond Grading Laboratories |
| IDLHCV | immediately dangerous to life or health concentration value |
| IDPL | Infectious Disease Pharmacokinetics Laboratory |
| IDRB | Inherited Disease Research Branch |
| IDRC | Infection Disease Research Core, Arizona Molecular Diagnostic and Research Laboratories |
| IDSI | Imaging Diagnostic Systems, Inc. |
| IDTL | Independent Detector Testing Laboratory |
| IE | Iso-Electric |
| IEF | electrofocusing |
| IEF | Iso-Electric Focusing |
| IEL | Integration Engineering Laboratory |
| IESL | Information Extraction and Synthesis Laboratory |
| IFA | Immunofluorescence assay |
| IFA | Immuno-Fluorescence Assay |
| IFA | Indirect immunofluorescence assay |
| IFA | Intrinsic Factor Antibody |
| IFAS | Integrated Fixed-film Activated Sludge |
| IFAT | Immuno-Fluorescence Antibody Test |
| IFCC | International Federation of Clinical Chemistry and Laboratory Medicine |
| IFEL | Irradiated Fuels Examination Laboratory |