| Abbreviation | Definition |
|---|---|
| HTRB(CBER) | Human Tissue and Reproduction Branch (CBER) |
| HTTP | HyperText Transfer Protocol |
| HUD | Humanitarian Use Device |
| Hx | Medical History |
| I&D | Incision and Drainage |
| I&O | Intake and Output |
| IA | Import Administration (United States Department of Commerce) |
| IAB(CDRH) | Information and Analysis Branch (CDRH) |
| IAB(ORA) | Infrastructure Applications Branch (ORA) |
| IACUC | Institutional Animal Care and Use Committee |
| IAG | Inter-Agency Agreement |
| IAL | Informal Action Level |
| IAMFES | International Association of Milk, Food and Environmental Sanitarians |
| IAN | International Approved Names for pharmacopoeial substances |
| IARC | International Agency for Research on Cancer |
| IAS(CFSAN) | Industry Activities Staff (CFSAN) |
| IAS(CFSAN) | International Affairs Staff (CFSAN) |
| IAS(OC) | International Agreements Staff (OC) |
| IAST | International Activities Staff |
| IAST(CFSAN) | International Activities Staff (CFSAN) |