List of medical abbreviations: A

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Abbreviation Meaning
ā (a with a bar over it) before (from Latin ante)
before
A adenosine
apical
a.a. of each (from Latin ana ana)
amino acids:
A1C glycosylated hemoglobin (hemoglobin A1c)
Aa. arteria, see Artery
AAA abdominal aortic aneurysm (pronounced "triple-A")
AAD antibiotic-associated diarrhea
AAI acute arterial insufficiency
AAPMC antibiotic-associated pseudomembranous colitis
AAT activity as tolerated
atypical antibody test
AAL anterior axillary line
AAOx3 awake, alert, and oriented, times 3 (i.e., to person, place, and time)
A/B acid-base ratio
ab abdomen, abdominal
abortion
Ab antibody
AB abortion
ABC airway, breathing, circulation
aspiration biopsy cytology
ABCD airway, breathing, circulation, disability
asymmetry, borders, color, diameter (features on considering "Is it a malignant melanoma?")
ABCD rating (a staging system for prostate cancer)
ABCs
ABCDs
ABCDEs
airway, breathing, circulation, etc. Refers to priority of needs in emergency situations. Exact spell-out and details after "C" vary by institution, but the "ABCs" theme is recurrent.
Abd abdomen
abdominal[abduction]
ABD army battle dressing
ABE acute bacterial endocarditis
ABG arterial blood gas
ABI acquired brain injury
ankle brachial pressure index
ABMT autologous bone marrow transplantation
Abn abnormal
ABO Landsteiner's blood grouping system
ABPA allergic broncho-pulmonary aspergillosis
ABPI ankle brachial pressure index
ABVD Doxorubicin (adriamycin), bleomycin, vinblastine, dacarbazine (first-line treatment for Hodgkin's lymphoma)
ABX antibiotics
a.c.
AC
before a meal (from Latin ante cibum)
AC abdominal circumference
assisted controlled ventilation
Acromioclavicular Joint
ACB aortocoronary bypass
AC&BC air conduction and bone conduction, as in Weber test
Acc accommodation (eye)
ACCU acute coronary care unit
ACD anemia of chronic disease
ACDF anterior cervical discectomy and fusion
Ace acetone
ACE angiotensin-converting enzyme
ACEI angiotensin-converting enzyme inhibitor(s)
ACh acetylcholine
AChE acetylcholine esterase
ACL anterior cruciate ligament
ACLS advanced cardiac life support
ACS altered conscious state
acute coronary syndrome
acute chest syndrome
ACTH adrenocorticotropic hormone
ACPO acute colonic pseudo-obstruction
ACU ambulatory care unit
ad. right ear (from Latin auris dexter)
AD Alzheimer's disease
acute distress
right ear (from Latin auris dexter)
ADA adenosine deaminase
ADC AIDS dementia complex
ADCC antibody-dependent cell-mediated cytotoxicity
ADD attention deficit disorder
ADH antidiuretic hormone
ADHD attention-deficit hyperactivity disorder
ADHR autosomal-dominant hypophosphatemic rickets
ADLs activities of daily living
ad lib as desired (from Latin ad libitum)
adm admission
Adn adnexae (for example, adnexae of the uterus)
ADP adenosine diphosphate
ad part. dolent to the painful parts (from Latin ad partes dolentes)
ADR adverse drug reaction
AEB as evidenced by (commonly used by nurses)
AED automated external defibrillator
antiepileptic drug(s)
AEM ambulatory electrocardiogram monitoring
AF atrial fibrillation
atrial flutter
amniotic fluid
AF-AFP amniotic fluid alpha fetoprotein
AFB acid-fast bacilli
AFI amniotic fluid index
AFib atrial fibrillation
AFL atrial flutter
AFNTR acute febrile nonhemolytic transfusion reaction
AFO ankle-foot orthosis
AFP alpha-fetoprotein
Ag antigen
AGA anti-gliadin antibodies
appropriate gestational age (see birth weight)
AGC atypical glandular cells
AGES criteria age, grade, extent, size (for tumors)
AGN acute glomerulonephritis
AH auditory hallucinations
a.h. every other hour (from Latin alternis horis)
AHD arteriosclerotic heart disease
AHF antihemophilic factor
AHG antihemophilic globulin
AHH aryl hydrocarbon hydroxylase
AHR airway hyper-reactivity
AHT antihyaluronic acid test
AI artificial insemination
aortic insufficiency
AICD automated implantable cardioverter-defibrillator
AID artificial insemination by donor
AIDS acquired immune deficiency syndrome
AIH artificial insemination by husband
AIHD artificial insemination by pooled husband and donor semen
AIPD acute infectious and parasitical diseases
autoimmune progesterone dermatitis
acute inflammatory demyelinating polyneuropathy
AIIRB angiotensin II receptor antagonist
AIN allergic interstitial nephritis
AIR Anterior interval release
AIS adenocarcinoma in situ
androgen insensitivity syndrome
AK acanthamoeba keratitis
aka also known as
AKA above-knee amputation
also known as
ALA aminolevulinic acid
Alc alcohol
ALF assisted living facility
ALG antilymphocytic globulin
ALI acute lung injury
Alk phos alkaline phosphatase (sometimes abbreviated as ALP)
ALL acute lymphoblastic leukemia
allergies
ALP alkaline phosphatase (sometimes abbreviated as Alk phos)
ALPS autoimmune lymphoproliferative syndrome
ALS amyotrophic lateral sclerosis
advanced life support
ALT alanine transaminase
altern. d. every other day (from Latin alterno die)
AMA advanced maternal age (35 years or greater)
against medical advice
antimitochondrial antibody
American Medical Association
Amb ambulate
AMC arthrogryposis multiplex congenita
AMI acute mesenteric ischemia
acute myocardial infarction
AML acute myeloid leukemia
AMO advanced medical optics
AMP adenosine monophosphate
Amp ampule
ampere
AMPA receptor alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor of the brain
AMS acute mountain sickness
atypical measles syndrome
Altered Mental Status
Amt amount
ANA antinuclear antibody
ANCA antineutrophil cytoplasmic antibody
ANDI aberrations of normal development and involution (of breast)
ANF atrial natriuretic factor
ANP atrial natriuretic peptide
ANS autonomic nervous system
Ant anterior
Anti- refers to an antibody to the suffixed antigen
ANTR asymmetrical tonic neck reflex
ANUG acute necrotizing ulcerative gingivitis
A&O or A/O aware and oriented or alert and oriented
A&Ox3 alert and oriented, times 3 (to person, place, and time)
A&Ox4 alert and oriented, times 4 (to person, place, time, and circumstances) (often used interchangeably with A&Ox3)
AODM adult-onset diabetes mellitus (now called diabetes mellitus type 2)
AOM acute otitis media
a.p. before a meal (from Latin ante prandium)
AP alkaline phosphatase
anteroposterior
angina pectoris
action potential
A&P auscultation and percussion
anatomy and physiology
A/P Assessment and Plan
APACHE II Acute Physiology and Chronic Health Evaluation II
APAP paracetamol (aka acetaminophen) (from its chemical name, N-acetyl-para-aminophenol)
automatic positive airway pressure
APC atrial premature contraction
antigen-presenting cell
activated protein C
APD adult polycystic disease
automated peritoneal dialysis
APKD adult polycystic kidney disease
APECED autoimmune polyendocrinopathy-candidiasis-ectodermal dystrophy
APGAR appearance, pulse, grimace, activity, respiration – used to assess newborns
APH antepartum haemorrhage
APLS antiphospholipid syndrome
APMPPE acute posterior multifocal placoid pigment epitheliopathy
applic. applicandus (Latin meaning "to be applied")
appy appendectomy
APP as per protocol
APR abdominoperineal resection
APS autoimmune polyendocrine/polyglandular syndrome
antiphospholipid syndrome
APSAC anisoylated plasminogen streptokinase activator complex
aPTT activated partial thromboplastin time
aq. water (from Latin aqua)
aq. bull. boiling water (from Latin aqua bulliens)
aq. calid. warm or hot water (from Latin aqua calida)
aq. dist. distilled water (from Latin aqua distillata)
aq. gel. cold water (from Latin aqua gelida)
AR aortic regurgitation
attributable risk
ARB angiotensin II receptor antagonist
ARBI Alcohol Related Brain Injury
ARC AIDS-related complex
ARDS acute respiratory distress syndrome
adult respiratory distress syndrome
ARF acute renal failure
Arg arginine
ARM artificial rupture of membranes (also abbreviated as AROM)
ARMD age-related macular degeneration
ARMS alveolar rhabdomyosarcoma
AROM active range of motion
artificial rupture of membranes
ART antiretroviral therapy
assuming room temperature (that is, the patient has died)
Assisted reproductive technology
ARVC arrhythmogenic right ventricular cardiomyopathy
ARVD arrhythmogenic right ventricular dysplasia
AS aortic stenosis
atherosclerosis
ankylosing spondylitis
ASA acetylsalicylic acid (aspirin)
ASAP as soon as possible
ASB asymptomatic bacteriuria
ASC ambulatory surgery center
atypical squamous cells
ASCA anti-Saccharomyces cerevisiae antibodies
ASC-H atypical squamous cells – cannot exclude HSIL
ASCAD arteriosclerotic coronary artery disease
ASCUS
ASC-US
atypical squamous cells of undetermined significance
ASCVD arteriosclerotic vascular disease (arteriosclerosis)
ASD atrial septal defect
ASGUS atypical squamous glandular cells of undetermined significance
ASH
ASHD
arteriosclerotic heart disease (coronary heart disease)
ASH alcoholic steatohepatitis
ASIS anterior superior iliac spine
ASO antistreptolysin-O
ASOT antistreptolysin-O titre
ASPECTS Alberta Stroke Program Early CT Score
Ass assessment
AST aspartate transaminase
ASX asymptomatic
A-T ataxia-telangiectasia
AT antithrombin
angiotensin
ATA antitransglutaminase antibodies
ATB antibiotic
ATCC American Type Culture Collection
ATG antithymic globulin
AT-III antithrombin III
ATN acute tubular necrosis
ATNR asymmetrical tonic neck reflex
ATP acute thrombocytopenic purpura
adenosine triphosphate
antitachycardia pacing
Atp atapical
ATRA all-trans retinoic acid
ATS antitetanus serum, that is, antitetanus immunoglobulins
AUC area under the curve (pharmacology)
aur. ear (from Latin auris)
aur. dextro. to right ear (from Latin auris dextrae)
aur. laev to left ear (from Latin auris laevae)
aurist. ear drops (from Latin auristillae)
AV arteriovenous
atrioventricular
AVF arteriovenous fistula
AVM arteriovenous malformation
AVN avascular necrosis
atrioventricular node
AVR aortic valve replacement
A&W
A/W
alive and well
Ax axillary
AXR abdominal x-ray
AYA adolescents and young adults
AZT azidothymidine