| Abbreviations | Meaning |
 | IQOLA | International Quality Of Life Assessment |
| IQWIG | Institut Für Qualität Und Wirtschaftlichkeit Im Gesundheitswesen. Institute For Quality And Efficiency In Health Care |
| IRA | Institut De Radiophysique Appliquée |
| IRB | Institutional Review Board |
| IRB | International Register On Biosafety |
| IRCAD | Institut De Recherche Contre Les Cancers De L'Appareil Digestif |
| IRCT | International Rehabilitation Council For Torture Victims |
| IRDES | Institut De Recherche Et Documentation En Économie De La Santé [Previously: CREDES] |
| IREB | Institut De Recherches Scientifiques Sur Les Boissons |
| IRECA | International Rescue And Emergency Care Association |
| IRH | Institute For Reproductive Health |
| IRIDE | Inventory Of Resources For Infectious Diseases In Europe |
| IRIS | Integrated Risk Information System [database] |
| IRLSSG | International Restless Legs Syndrome Study Group |
| IRM | HCFA's Information Resources Management Plan |
| IRMEF | Institut Régional De La Mère, De L'Enfant Et De La Famille |
| IRMO | Information Resources Management Office (CDC) |
| IRMVS | Institute For Reparative Medicine And Vascular Surgery |
| IRPA | International Radiation Protection Association |
| IRPA | International Retinitis Pigmentosa Association |
| IRPTC | International Register Of Potentially Toxic Chemicals |
| IRS | Illinois Radiological Society |
| IRSA | International Radiosurgery Support Association |
| IRSA | International Rett Syndrome Association |
| IRSC / CIHR | Instituts De Recherche En Santé Du Canada / Canadian Institutes Of Health Research |
| IRSN | Institut De Radioprotection Et De Sûreté Nucléaire |
| IRSQ | Internet Reference Services Quarterly |
| IRSSTQ | Institut De Recherche En Santé Et Sécurité Du Travail Du Québec |
| ISA | International Society Of Andrology |
| ISA | International Society Of Audiology |
| ISA | International Stuttering Association |
| ISA | Irish Stammering Association |
| ISAAC | International Society For Augmentative And Alternative Communication |
| ISAC | International Society For Analytical Cytology |
| ISACCD | International Society For Adult Congenital Cardiac Disease |
| ISAD | International Society Of Abortion Doctors |
| ISAD | International Stuttering Awareness Day |
| ISAKOS | International Society Of Arthroscopy, Knee Surgery, And Orthopaedic Sports Medicine |
| ISAM | International Society For Aerosols In Medicine |
| ISAP | International Society For Anaesthetic Pharmacology |
| ISAP | Internet Self-Assessment In Pharmacology |
| ISAPA | International Society For Aging And Physical Activity |
| ISARS | Institut Fédératif Saint-Antoine De Recherche Sur La Santé |
| ISB | International Society Of Biomechanics |
| ISB / SIB/ SIB | Institut Suisse De Bioinformatique / Schweizerisches Institut Für Bioinformatik / Swiss Institute Of Bioinformatics |
| ISBM | International Society Of Behavioral Medicine |
| ISBOR | International Society Of Breath Odor Research |
| ISBP | International Society Of Blood Purification |
| ÏSBS | International Society For Biophysics And Imaging Of The Skin |
| ISBS | International Society Of Biomechanics In Sports |
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