IAC (intra-aortic balloon pressure/pump)

IAC (interposed abdominal compression (CPR))

IADL (instrumental activities of daily living)

IAH (intra-abdominal hypertension)

IAP (intra-abdominal pressure)

IAW (in accordance with)

IBC (iron binding capacity)

IBCLC (international board certified lactation consultant)

IBD (inflammatory bowel disease; irritable bowel disease)

IBM (inclusion body myositis)