17-OHS: 17-hydroxysteroid
A fib: Atrial fibrillation
A/a: Alveolar-Arterial
ABC: Airway, Breathing, Circulation
ABG: arterial blood gas
AC: Acromioclavicular
ACE: Angiotensin-converting enzyme
ACL: anticardiolipin
ACLS: Advanced Cardiac Life Support
ACOG: American College of Obstetrics and Gynecology
ACTH: adrenocorticotropic hormone
AD: Alzheimer's dementia
AFB: Acid Fast Bacilli
AFP: Alpha fetoprotein
afv: amniotic fluid volume
AGCUS: atypical glandular cells of undetermined significance
AI: amnioinfusion
ALT: alanine aminotransferase
ANA: Anti Nuclear Antibody
anca: anti neutrophil cytoplasmic antibody
AP: anteroposterior
aps: antiphospholipid syndrome
APSAC: anistreplase, anisoylated plasminogen-streptokinase activator complex
aPTT: activated partial thromboplastin
ARC: AIDS Related Complex
ARDS: Adult Respiratory Distress Syndrome
ARF: Acute Renal Failure
ASA: acetylsalicylic acid
ASAP: as soon as possible
ascus: atypical squamous cells of undetermined significance
ASO: antistreptolysin O antibody
AST: Aspartate Aminotransferase
ATN: Acute tubular necrosis
AV: arteriovenous
AV: atrioventricular
BAER: Brain stem auditory evoked responses
BBT: Basal Body Temperature
BCG: Bacille Calmette Guerin
bcp: birth control pill
bhcg: beta human chorionic gonadotropin