| IAS | immunosuppressive acidic substance; infant apnea syndrome; insulin autoimmune syndrome; interatrial septum; interatrial shunting; internal anal sphincter; International Acquired Immune Deficiency Syndrome Society; intra-amniotic saline |
|---|---|
| IASA | interatrial septal aneurysm |
| IASD | interatrial septal defect; inter-auricular septal defect |
| IASH | isolated asymmetric septal hypertrophy |
| IASHS | Institute for Advanced Study in Human Sexuality |
| IASL | International Association for Study of the Liver |
| IASP | International Association for Study of Pain |