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These are the abbreviations used commonly in medical practice both in verbal communication and in the medical record.

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A&O alert and oriented
A&O×3 awake (or alert) and oriented to person, place, and time
A&O×4 awake (or alert) and oriented to person, place, time, and situation
A&P active and present; anterior and posterior; assessment and plans; auscultation and percussion
A&W alive and well
A1c hemoglobin A1c
AA aplastic anemia; Alcoholics Anonymous
AAA abdominal aortic aneurysm
AAO awake, alert, and oriented
AAO×3 awake and orientated to time, place, and person
ABC absolute band counts; absolute basophil count; apnea, bradycardia, and cytology; aspiration, biopsy, and cytology; artificial beta cells
Abd abdomen
ABG arterial blood gases
ABO blood group system (A, AB, B, and O)
ABP arterial blood pressure
ABW actual body weight
ABx antibiotics
AC before meals (ante cibos)
ACE angiotensin-converting enzyme
ACE-I angiotensin-converting enzyme inhibitor
ACLS advanced cardiac life support
ACS acute coronary syndromes
ACTH adrenocorticotropic hormone
AD Alzheimer disease; right ear (auris dextra)
ADA American Diabetes Association; adenosine deaminase
ADE adverse drug effect (or event)
ADH antidiuretic hormone
ADHD attention-deficit hyperactivity disorder
ADL activities of daily living
ADR adverse drug reaction
AF atrial fibrillation
AFB acid-fast bacillus; aortofemoral bypass; aspirated foreign body
AFEB afebrile
AI aortic insufficiency
AIDS acquired immune deficiency syndrome
AKA above-knee amputation; alcoholic ketoacidosis; all known allergies; also known as
AKI acute kidney injury
ALFT abnormal liver function test
ALL acute lymphoblastic leukemia; acute lymphocytic leukemia
ALP alkaline phosphatase
ALS amyotrophic lateral sclerosis
ALT alanine transaminase (SGPT); alanine aminotransferase
AMA against medical advice; American Medical Association; antimitochondrial antibody
AMI acute myocardial infarction
AML acute myelogenous leukemia
Amp ampule
ANA antinuclear antibody
ANC absolute neutrophil count
ANLL acute nonlymphocytic leukemia
AODM adult-onset diabetes mellitus
AOM acute otitis media
AP anteroposterior
APAP acetaminophen (acetyl-p-aminophenol)
aPTT activated partial thromboplastin time
ARB angiotensin receptor blocker
ARC AIDS-related complex
ARD acute respiratory disease; adult respiratory disease; antibiotic removal device; aphakic retinal detachment
ARDS adult respiratory distress syndrome
ARF acute renal failure; acute respiratory failure; acute rheumatic fever
AROM active range of motion
AS left ear (auris sinistra)
ASA aspirin (acetylsalicylic acid)
ASCVD arteriosclerotic cardiovascular disease
ASD atrial septal defect
ASH asymmetric septal hypertrophy
ASHD arteriosclerotic heart disease
AST aspartate transaminase (SGOT); aspartate aminotransferase
ATG antithymocyte globulin
ATN acute tubular necrosis
AU each ear (auris uterque)
AV arteriovenous; atrioventricular; auditory visual
AVR aortic valve replacement
BBB bundle branch block; blood–brain barrier
BC blood culture
BCOP Board Certified Oncology Pharmacist
BCP birth control pill
BCPP Board Certified Psychiatric Pharmacist
BCPS Board Certified Pharmacotherapy Specialist
BE barium enema
BG blood glucose
bid twice daily (bis in die)
BKA below-knee amputation
BM bone marrow; bowel movement; an isoenzyme of creatine phosphokinase
BMC bone marrow cells
BMD bone mineral density

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