I (iodine [element])

i.e. (that is (L. id est))

I/E (inspiratory/expiratory)

I&D (incision and drainage)

I&O (intake and output)

IA (intra-articular)

IA (intra-arterial)

IA (intra-amniotic)

IABC (incidental appendectomy)

IABP (intra-aortic balloon counterpulsation)