| HAPC | high-amplitude peristaltic contraction; hospital-acquired penetration contact |
|---|---|
| IAHD | idiopathic acquired hemolytic disorder |
| IARSA | idiopathic acquired refractory sideroblastic anemia |
| IAS | immunosuppressive acidic substance; infant apnea syndrome; insulin autoimmune syndrome; interatrial ... |
| ICASO | International Committee of Acquired Immunodeficiency Syndrome Service Organisations |