AP
anteroposterior
ABG
arterial blood gas
AC
air conduction
ACE
angiotensin-converting enzyme (inhibitor)
ACTH
adrenocorticotropic hormone
ADH
antidiuretic hormone
AED
automatic external defibrillator
AICD
automatic implantable cardioverter–defibrillator
AIDS
acquired immune deficiency syndrome
ALS
amyotrophic lateral sclerosis
AP
anteroposterior
ARDS
acute respiratory distress syndrome
ARF
acute renal failure
ARMD, AMD
age-related macular degeneration
Ast
astigmatism
AV
atrioventricular; arteriovenous
BC
bone conduction
BCC
basal cell carcinoma
BE
barium enema
BG
blood glucose
BM
bowel movement
BMI
body mass index
BMT
bone marrow transplant
BNO
bladder neck obstruction