ā
before
@
at
aa
of each
ac
before meals
AD
right ear
ADH
antidieuritic hormone
ad lib
as desired
AM
between midnight-noon
AMA
against medical advice
a.m.
morning
amp
ampule
ant
anterior
AP
anteroposterior
aq
aqueous
AS
left ear
ASA
aspirin
ASAP
as soon as possible
as tol
as tolerated
AV
arteriovenous
ax
axillary