[ A ]

• ARBD  alcohol-related birth defects
• ARBV  Arbia virus
• ARC  absolute reticulocyte count; accelerating rate calorimetry; Accreditation Review Council; acquired immunodeficiency syndrome-related complex; active renin concentration; AIDS-related complex; American Red Cross; anomalous retinal correspondence; antigen reactive cell; arcuate; Arthritis Rehabilitation Center; arthrogryposis-renal dysfunction-cholestasis [syndrome]; Association for Retarded Children; atypical reparative changes; automatic exposure control
• ARCA  acquired red cell aplasia
• ARCD  age-related cognitive decline
• ARCH  Amiodarone Reduces Coronary Artery Bypass Grafting Hospitalization [trial]; automated record for child health
• ARCI  Addiction Research Center Inventory
• ARCOS  Auckland Region Coronary or Stroke [study]
• ARCS  Associate of the Royal College of Science; Atherosclerosis Risk in Communities Study
• ARC-ST  Accreditation Review Council for Educational Programs in Surgical Technology
• ARD  absolute reaction of degeneration; acute radiation disease; acute respiratory disease; adult respiratory distress; allergic respiratory disease; ancillary report display; anorectal dressing; aortic root diameter; arthritis and rheumatic diseases; atopic respiratory disease
• AR-DLMD  autosomal recessive Duchenne-like muscular dystrophy
• ARDMS  American Registry of Diagnostic Medical Sonographers
• ARDS  acute respiratory distress syndrome; adult respiratory distress syndrome
• ARE  active-resistive exercises; AIDS-related encephalitis; antioxidant response element
• AREDS  Age-Related Eye Disease Study
• AREDYLD  acrorenal field defect, ectodermal dysplasia, lipoatrophic diabetes [syndrome]
• AREPA  acetazolamide-responsive familial paroxysmal ataxia
• ARES  antireticulo-endothelial serum
• AREV  Advanced Revelations [platform for database distribution]
• ARF  acute renal failure; acute respiratory failure; acute rheumatic fever; Addiction Research Foundation; ambulance report form; area resource file
• ARFC  active rosette-forming T-cell; autologous rosette-forming cell
• ARFD  acrorenal field defect
• AR-FSP  autosomal recessive familial spastic paraplegia
• ARG, Arg  arginine
• arg  arginine; silver [Lat. argentum]
• ARGAMI  Argatroban Compared with Heparin in Myocardial Infarction Treated with Recombinant Tissue Plasminogen Activator
• ARGS  antitrypsin-related gene sequence
• ArGV  Artogeia rapae granulovirus
• ARI  absolute risk increase; activation-recovery interval; acute renal insufficiency; acute respiratory illness; airway reactivity index; aldolase reductase inhibitor; annual rate of infection; anxiety reaction, intense
• ARIA  acetylcholine receptor-inducing activity; allergic rhinitis and its impact on asthma; automated radioimmunoassay
• ARIC  Atherosclerosis Risk in Communities [study]
• ARIF  Aggressive Research Intelligence Facility [UK]
• ARIMA  autoregressive integrated moving average
• ARIS  Andrology Research Information System; Anturan Reinfarction Italian Study; auto-regulated inspiratory support
• Ar Kr  argon-krypton [laser]
• ARKV  Arkonam virus
• ARL  Association of Research Libraries; average remaining lifetime
• ARLD  alcohol-related liver disease
• AR-LGMD  autosomal recessive limb muscular dystrophy
• ArLV  artichoke latent virus
• ArLVM  artichoke latent virus M
• ArLVS  artichoke latent virus S
• ARM  adrenergic receptor material; advanced respiratory mechanics; aerosol rebreathing method; ambulatory renal monitor; anorectal manometry; anxiety reaction, mild; arginine-rich motif; Armenian [hamster]; artificial rupture of membranes; associations rule mining [algorithm]; atomic resolution microscopy
• ARMA  autoregressive moving average
• ARMD  age-related muscle degeneration
• ARMS  access by radial artery multilink stent; adverse reaction monitoring system; amplification refractory mutation system
• ARMV  Arumateua virus
• ARN  acute renal necrosis; acute retinal necrosis; arcuate nucleus; Association of Rehabilitation Nurses
• ARNMD  Association for Research in Nervous and Mental Diseases
• ARNP  Advanced Registered Nurse Practitioner
• ARNSHL  autosomal recessive non-syndromic hearing loss
• ARNT  aryl hydrocarbon nuclear translocator; aryl hydrocarbon receptor nuclear translocator
• ARNV  Aruana virus
• ARO  adjusted relative odds; Associate for Research in Ophthalmology
• AROA  autosomal recessive ocular albinism
• AROAV  Aroa virus
• AROM  active range of motion; artificial rupture of membranes
• arom  aromatic
• ARP  absolute refractory period; address resolution protocol; American Registry of Pathologists; anticipated recovery path; apolipoprotein regulatory protein; assay reference plasma; assimilation regulatory protein; atrial refractory period; at risk period; automaticity recovery phase
• ARPA  Advanced Research Projects Agency
• ARPANET  Advanced Research Projects Agency Network
• ARPC  Akaike relative power contribution
• ARPD  autosomal recessive polycystic disease
• ARPES  angular resolved photoelectron spectroscopy
• ARPKD  autosomal recessive polycystic kidney disease
• ARPT  American Registry of Physical Therapists
• ARR  absolute risk reduction; aortic root replacement
• arr  arrest, arrested
• ARRC  Associate of the Royal Red Cross
• ARREST  Amiodarone in Out-of-Hospital Resuscitation of Refractory Sustained Ventricular Tachyarrhythmia; Amsterdam Resuscitation Study
• ARRP  autosomal recessive retinitis pigmentosa
• ARRS  American Roentgen Ray Society
• ARRT  American Registry of Radiologic Technologists
• ARS  acquiescence response scale; acute radiation syndrome or sickness; adult Reye's syndrome; alcohol-related seizures; alizarin red S; American Radium Society; American Rhinologic Society; antirabies serum; arsphenamine; arylsulfatase; Atherogenic Risk Study; autonomously replicating sequence
• Ars  arsphenamine
• ARSA  American Reye's Syndrome Association; arylsulfatase A
• ARSAC  Administration of Radioactive Substances Advisory Committee
• ARSACS  autosomal recessive spastic ataxia of Charlevoix-Saguenay
• ARSB  arylsulfatase B
• ARSC  arylsulfatase C; Associate of the Royal Society of Chemistry
• ARSM  acute respiratory system malfunction
• ARSPH  Associate of the Royal Society for the Promotion of Health
• ART  absolute retention time; Accredited Record Technician; Achilles reflex time; acoustic reflex test; acoustic reflex threshold; adaptive resonance theory; algebraic reconstruction technique; algebraic reconstructive technique; AngioJet Rapid Thrombectomy Catheter Study; antiretroviral therapy; artery; assisted reproductive technique; automated radiation therapy; automated reagin test; automaticity recovery time
• art  artery, arterial; articulation; artificial
• ARTF  artificial
• arth  arthritis
• artic  articulation, articulated
• artif  artificial
• ARTIS  Human Immunodeficiency Virus/Acquired Immunodeficiency Syndrome [HIV/AIDS] Treatment Information Service [NLM database]
• ARTISTIC  Angiorad Radiation Technology for In-Stent Restenosis Trial in Coronaries
• ARTMAP  adaptive resonance theory mapping
• Art O₂  arterial oxygen flow
• ARTS  Arterial Revascularization Therapies Study
• ARU  arthritis rehabilitation unit
• ARUAV  Aruac virus
• ARV  acquired immunodeficiency syndrome-related virus; Adelaide River virus; anterior right ventricle; antiretroviral; avian orthoreovirus; avian reovirus
• ARV-A  aquareovirus A
• ARV-B  aquareovirus B
• ARV-C  aquareovirus C
• ARVD  arrhythmogenic right ventricular dysplasia
• ARV-D  aquareovirus D
• ARV-E  aquareovirus E
• ARV-F  aquareovirus F
• ARVP  arginine-vasopressin
• ARX  autoregressive with exogenous input [model]
• ARZAP  archive zap process [database element]
• AS  above scale; absence of seizures; access service [to health information]; acetylstrophanthidin; acidified serum; acoustic schwannoma; acoustic stimulation; active sarcoidosis; active sleep; Adams-Stokes [disease]; adolescent suicide; aerosol sensitivity; aerosol sensitization; allele-specific; Alport syndrome; alveolar sac; amphetamine sulfate; amyloid substance; anabolic steroid; anal sphincter; androsterone sulfate; Angelman syndrome; angiosarcoma; ankylosing spondylitis; anorexia site [database, Italy]; anovulatory syndrome; anterior synechia; anteroseptal; anterosuperior; antiserum; antisocial; antistreptolysin; antral spasm; anxiety state; aortic sound; aortic stenosis; approaching significance [statistical]; aqueous solution; aqueous suspension; archives server; area of stenosis; arteriosclerosis; artificial sweetener; aseptic meningitis; asparagine synthetase; Asperger syndrome; assisted suicide; astigmatism; asymmetric; atherosclerosis; atrial septum; atrial stenosis; atropine sulfate; audiogenic seizure; Auto-Suture; left ear [Lat. auris sinistra; JCAHO unapproved abbreviation]
• As  arsenic; astigmatism; asymptomatic
• A(s)  asplenia syndrome
• As  ampere second
• A/s  ampere per second
• A_s  shifted ligand concentration [amount/volume]
• aS  absiemens
• as  left ear [Lat. auris sinistra]
• ASA  acetylsalicylic acid; active systemic anaphylaxis; acute severe asthma; Adams-Stokes attack; ambulatory services architecture; American Society of Anesthesiologists; American Standards Association; American Surgical Association; aminosalicylic acid; anterior spinal artery; antibody to surface antigen; argininosuccinic acid; arylsulfatase-A; aspirin-sensitive asthma; asthma-nasal polyps-aspirin intolerance [triad]
• ASAAC  Acetylsalicylic Acid Aorto-Coronary Bypass Surgery; Acetylsalicylic Acid vs Anticoagulants [study]
• ASAAD  American Society for the Advancement of Anesthesia in Dentistry
• ASAC  acidified serum-acidified complement
• ASAH  antibiotic sterilized aortic valve homograft
• ASAHP  American Society of Allied Health Professions
• ASAIO  American Society for Artificial Internal Organs
• ASAL  arginosuccinic acid lyase
• ASAP  Academic Strategic Alliance Program; Acetylsalicylic Acid Persantine [study]; American Society for Adolescent Psychology; apparatus for sensing accuracy of position; arbitrary signatures from amplification profiles; Areawide Stroke Awareness Program; as soon as possible; Azimilide Supraventricular Arrhythmia Program [trial]
• ASAPS  American Society of Aesthetic Plastic Surgery
• ASAS  Anderson Symptom Assessment Scale; argininosuccinate synthetase
• ASAT  aspartate aminotransferase
• ASB  American Society of Bacteriologists; anencephaly-spina bifida [syndrome]; anesthesia standby; Anxiety Scale for the Blind; asymptomatic bacteriuria
• ASBMT  American Society for Blood and Marrow Transplantation
• ASBS  American Society for Bariatric Surgery
• ASBV, ASBVd  avocado sunblotch viroid
• ASC  acetylsulfanilyl chloride; acute suppurative cholangitis; altered state of consciousness; ambulatory surgical center; American Society of Cytology; anterior subcapsular cataract; antibody-secreting cell; antigen-sensitive cell; ascorbate, ascorbic acid; asthma symptom checklist; auditory sequence comparison; automatic sensitivity control
• asc  anterior subcapsular; ascending
• ASCAD  atherosclerotic coronary artery disease
• ASCAo  ascending aorta
• ASCB  Asymptomatic Cervical Bruit [study]
• ASCH  American Society of Clinical Hypnosis
• ASCI  Accelerated Strategic Computing Initiative; acute spinal cord injury; American Society for Clinical Investigation; automated stress relaxation and creep indentation
• ASCIA  American Spinal Cord Injury Association
• ASCII  American Standard Code for Information Interchange
• ASCLT  American Society of Clinical Laboratory Technicians
• ASCMS  American Society of Contemporary Medicine and Surgery
• ASCN  American Society for Clinical Nutrition
• ASCO  American Society of Clinical Oncology; American Society of Contemporary Ophthalmology
• ASCOT  Anglo-Scandinavian Cardiac Outcomes Trial; a severity characterization of trauma
• ASCOTA  American Student Committee of the Occupational Therapy Association
• ASCP  American Society of Clinical Pathologists; American Society of Consulting Pharmacists
• AsCPV  Actias selene cypovirus; Agrotis segetum cypovirus
• ASCR  American Society of Chiropodical Roentgenology
• ASCS  admissions scheduling system
• ASCT  autologous stem cell transplantation
• ASCUS  atypia of squamous cells of undetermined significance
• ASCUS-H  atypical squamous cell of undetermined significance, high-grade squamous intraepithelial lesion
• ASCUS-L  atypical squamous cell of undetermined significance, low-grade squamous intraepithelial lesion
• ASCVD  arteriosclerotic cardiovascular disease; atherosclerotic cardiovascular disease
• ASD  adaptive seating device; aldosterone secretion defect; Alzheimer senile dementia; antisiphon device; argininosuccinic acid synthetase deficiency; arthritis syphilitica deformans; arthroscopic subacromial decompression; atrial septal defect
• ASDB  Active Substance Database; Annotation and Similarity [protein] Database
• A-SDC  anomaly-symptomatic deformity complex
• ASDC  American Society of Dentistry for Children; Association of Sleep Disorders Centers
• ASDE  Accelerated Strategic Computing Initiative [ASCI] Simulation Development Environment
• ASDH  acute subdural hemorrhage or hematoma
• ASDOS  Atrial Septal Defect Occlusion System [study]
• ASDP  anal sphincter dysplasia
• ASDS  American Society for Dermatological Surgery
• ASE  acute stress erosion; American Society of Electrocardiography; application service element; axilla, shoulder, and elbow
• ASEX  Arizona Sexual Experiences Scale
• ASF  African swine fever; aniline-sulfur-formaldehyde [resin]
• ASFR  age-specific fertility rate
• ASFV  African swine fever virus
• ASG  advanced cell group; American Society for Genetics; Army Surgeon General; aspermiogenesis
• ASGBI  Association of Surgeons of Great Britain and Ireland
• ASGE  American Society for Gastrointestinal Endoscopy
• ASGP  asialoglycoprotein
• AS/GP  antiserum, guinea pig
• ASGR  asialoglycoprotein receptor
• ASGV  apple stem grooving virus
• ASH  Action on Smoking and Health; aldosterone-stimulating hormone; American Society of Hematology; ankylosing spinal hyperostosis; antistreptococcal hyaluronidase; asymmetric septal hypertrophy
• AsH  astigmatism, hypermetropic
• A&Sh  arm and shoulder
• ASHA  American School Health Association; American Social Health Association; American Speech and Hearing Association
• ASHAC  acquired immunodeficiency syndrome self-help and care
• ASHBEAMS  American Society of Hospital-Based Emergency Aeromedical Services
• ASHBM  Associate Scottish Hospital Bureau of Management
• ASHCRM  American Society of Health Care Risk Managers
• ASHCSP  American Society for Hospital Central Service Personnel [of AHA]
• ASHCVD  atherosclerotic hypertensive cardiovascular disease
• ASHD  arteriosclerotic heart disease; atrioseptal heart disease
• ASHE  American Society for Hospital Engineering
• ASHET  American Society for Health Manpower Education and Training
• ASHFSA  American Society for Hospital Food Service Administrators
• ASHG  American Society for Human Genetics
• ASHI  Association for the Study of Human Infertility
• ASHL  Association of Scottish Health Science Librarians
• ASHM  Australasian Society for Human Immunodeficiency Virus Medicine
• ASHN  acute sclerosing hyaline necrosis
• AS/Ho  antiserum, horse
• ASHP  American Society for Hospital Planning; American Society of Hospital Pharmacists
• ASHPA  American Society for Hospital Personnel Administration
• ASHT  American Society of Hand Therapists
• ASHV  Arctic squirrel hepatitis virus
• ASI  Addiction Severity Index; anxiety state inventory; anxiety status inventory; arthroscopic screw installation
• a-Si  amorphous silicon
• ASIA  American Spinal Injury Association
• ASIC  acid sensing ion channel; application-specific integrated circuit
• aSi/CsI  cesium iodide and amorphous silicon [x-ray detector]
• ASIF  Association for Study of Internal Fixation
• ASII  American Science Information Institute
• ASIM  American Society of Internal Medicine
• ASIP  atypical protein kinase C isotype-specific interacting protein
• ASIR  age-standardized incidence rate
• ASIS  American Society for Information Science; American Study of Infarct Survival; Angina and Silent Ischemia Study; average severity of index score; anterior superior iliac spine
• ASIST  Atenolol Silent Ischemia Trial
• ASK  anomalous state of knowledge; antistreptokinase; Australian Streptokinase [trial in stroke]
• ASL  angiosarcoma of liver; antistreptolysin; argininosuccinate lyase
• ASLIB  Association of Special Libraries and Information Bureau
• ASLM  American Society of Law and Medicine
• ASLN  Alport syndrome-like hereditary nephritis
• ASLO  antistreptolysin O
• ASLT  antistreptolysin test
• ASLV  avian sarcoma and leukosis virus
• ASM  acid sphingomyelinase; active shape model [radiological image]; age-specific mortality; airway smooth muscle; American Society for Microbiology; angular second moment; anterior scalenus muscle
• AsM  astigmatism, myopic
• asm  age-specific mortality
• ASMA  Aerospace Medical Association; antismooth muscle antibody
• ASMC  arterial smooth muscle cell
• ASMD  anterior segment mesenchymal dysgenesis; atonic sclerotic muscle dystrophy
• ASME  Association for the Study of Medical Education
• ASMI  anteroseptal myocardial infarct
• As/Mk  antiserum, monkey
• ASMPA  Armed Services Medical Procurement Agency
• ASMR  age-standardized mortality ratio
• ASMS  archival [imaging] storage management system
• ASMT  acetylserotonin methyltransferase; American Society for Medical Technology
• ASMTY  acetylserotonin methyltransferase Y
• ASN  abstract syntax notation; alkali-soluble nitrogen; American Society of Nephrology; American Society of Neurochemistry; arteriosclerotic nephritis; asparagine; Associate in Nursing
• Asn, asn  asparagine
• ASO  administrative services only; AIDS service organization; allele-specific oligonucleoside; antistreptolysin O; arteriosclerosis obliterans
• ASOD  anterior segmental ocular dysgenesis
• AS ON  antisense oligonucleotide
• ASOS  American Society of Oral Surgeons
• ASOT  antistreptolysin-O test
• ASP  abnormal spinal posture; active server page or pages; active server processor; acute suppurative parotitis; acute symmetric polyarthritis; affected sibling pair; African swine pox; aged substrate plasma; alkali-stable pepsin; American Society of Parasitology; amnesic shellfish poisoning; ankylosing spondylitis; anorectal malformation, sacral bony abnormality, presacral mass [association]; antibody-specific prediction; antisocial personality; aortic systolic pressure; application service provider; area systolic pressure; asparaginase; aspartic acid
• Asp  aspartic acid; asparaginase
• asp  aspartame; aspartate, aspartic acid; aspiration; automatic signal processing
• ASPA  American Society of Physician Analysts; American Society of Podiatric Assistants; aspartoacylase
• ASPAC  Asia-Pacific [regional study]
• ASPAT  antistreptococcal polysaccharide test
• ASPCR, AS-PCR  allele-specific polymerase chain reaction
• ASPD  antisocial personality disorder
• ASPDM  American Society of Psychosomatic Dentistry and Medicine
• ASPECT  Anticoagulants in Secondary Prevention of Events in Coronary Thrombosis; Approach to Systematic Planning and Evaluation of Clinical Trials
• ASPEN  American Society for Parenteral and Enteral Nutrition
• ASPG  antispleen globulin
• AS/PI  anterior superior/posterior inferior
• ASPIRE  Action on Secondary Prevention by Intervention to Reduce Events
• ASPM  American Society of Paramedics
• ASPO  American Society for Psychoprophylaxis in Obstetrics; American Society of Pediatric Otolaryngology
• ASPP  Association for Sane Psychiatric Practices
• ASPREN  Australian Sentinel Practice Research Network
• ASPRS  American Society of Plastic and Reconstructive Surgeons
• ASPS  advanced sleep phase syndrome; Australian Swedish Pindolol Study
• ASPSOM  adaptive structure probabilistic self-organizing map
• ASPV  apple stem pitting virus
• ASPVD  atherosclerotic peripheral vascular disease; atherosclerotic pulmonary vascular disease
• ASQ  Abbreviated Symptom Questionnaire; Anxiety Scale Questionnaire
• ASR  adrenal/spleen ratio; age-standardized rate; aldosterone secretion rate; antistreptolysin reaction; automated speech recognition
• AS/Rab  antiserum, rabbit
• ASRT  American Society of Radiologic Technologists; American Society of Registered Technologists
• ASS  Aarskog-Scott syndrome; acute serum sickness; acute spinal stenosis; acute stroke study; anterior superior spine; argininosuccinate synthetase; Auckland Stroke Study
• ASSA, ASSAS  aminopterin-like syndrome sine aminopterin
• ASSC  acute splenic sequestration crisis
• AS-SCORE  age, stage of disease, physiological system involved, complications, response to therapy
• ASSENT  Assessment of the Safety and Efficacy of a New Thrombolytic Agent
• ASSERT  [improving] Alcohol and Substance Abuse Services and Educating Providers to Refer Patients to Treatment
• ASSET  Anglo-Scandinavian Study of Early Thrombolysis; Atorvastatin Simvastatin Safety and Efficacy Trial
• ASSH  American Society for Surgery of the Hand
• ASSI  Accurate Surgical and Scientific Instruments
• ASSIA  Applied Social Science Index and Abstracts [UK]
• assim  assimilate, assimilation
• ASSIST  American Stop Smoking Intervention Study
• ASSO  American Society for the Study of Orthodontics
• Assoc  association, associate
• ASSP  argininosuccinate synthetase pseudogene
• ASSR  adult situation stress reaction; auditory steady-state response
• ASSURE  A Stent vs Stent Ultrasound Remodeling Evaluation
• ASSVd  Apple scar skin viroid
• ASSX  argininosuccinate synthetase pseudogene
• AST  above selected threshold; allele-specific transcript; allergy serum transfer; angiotensin sensitivity test; anterior spinothalamic tract; antimicrobial susceptibility test; antistreptolysin test; aspartate aminotransferase (SGOT); Association of Surgical Technologists; astigmatism; atrial overdrive stimulation rate; audiometry sweep test; Australian Streptokinase Trial
• Ast  astigmatism
• ASTA  anti-alpha-staphylolysin
• ASTAM  American Society for Testing and Materials
• ASTECS  Antenatal Steroid Therapy in Elective Cesarean Section [study]
• ASTH, Asth  asthenopia
• ASTHO  Association of State and Territorial Health Officers; Association of State and Territorial Health Officials
• ASTI  antispasticity index
• ASTM  American Society for Testing and Materials
• ASTMH  American Society of Tropical Medicine and Hygiene
• ASTO  antistreptolysin O
• as tol  as tolerated
• ASTPHND  Association of State and Territorial Public Health and Nutrition Directors
• ASTRO  American Society for Therapeutic Radiology and Oncology
• AstV  Astrovirus
• ASTZ  antistreptozyme
• ASUB  active substance [UMLS]
• ASV  anodic stripping voltammetry; antisiphon valve; anti-snake venom; autologous saphenous vein; avian sarcoma virus
• ASV-CT10  avian sarcoma virus CT10
• ASVO  American Society of Veterinary Ophthalmology
• ASVPP  American Society of Veterinary Physiologists and Pharmacologists
• ASW  artificial sweetener
• ASWC  averaged spike and wave complex [EEG]
• Asx  amino acid that gives aspartic acid after hydrolysis; asymptomatic
• asym  asymmetry, asymmetric
• AT  abdominal thrusts; Achilles tendon; Achard-Thiers [syndrome]; achievement test; activity training; acute thrombosis; adaptive thermogenesis; adenine-thymine; adenine-thyronine; adipose tissue; adjunctive therapy; adnexal torsion; air temperature; allergy treatment; amino acid transporter; aminotransferase; aminotriazole; amitriptyline; anaerobic threshold; anaphylotoxin; angiotensin; anterior tibia; antithrombin; antitrypsin; antral transplantation; applanation tonometry; ataxia-telangiectasia; atmosphere; atraumatic; atresia, tricuspid; atrial tachycardia; atrial tumor; atropine; attenuate, attenuation; autoimmune thrombocytopenia; axonal terminal; old tuberculin [Gr. alt Tuberkulin]
• A-T  ataxia-telangiectasia
• AT₁  angiotensin II type 1
• AT₁₀  dihydrotachysterol
• AT I  angiotensin I
• AT II  angiotensin II
• AT III  angiotensin III; antithrombin III
• At  acidity, total; angiotensin; antithrombin; astatine; atrium, atrial
• A_t  amount in tissue
• at  air tight; atom, atomic; technical atmosphere
• ATA  alimentary toxic aleukia; American Telemedicine Association; American Thyroid Association; aminotriazole; antithymic activity; antithyroglobulin antibody; anti-Toxoplasma antibody; atmosphere absolute; aurintricarboxylic acid
• ATACS  Antithrombotic Therapy in Acute Coronary Syndromes [trial]
• ATAI  acute traumatic aortic injury
• ATB  Articulated Total Body [model]; at the time of the bomb [A-bomb in Japan]; atrial tachycardia with block
• Atb  antibiotic
• ATBC  Alpha-Tocopherol/Beta Carotene [cancer prevention study]
• ATC  activated thymus cell; alpha tocopherol; anaplastic thyroid carcinoma; Anatomical Therapeutic Chemical [classification]; around the clock; certified athletic trainer
• ATCase  aspartate transcarbamoylase
• ATCC  American Type Culture Collection
• ATCL  adult T-cell leukemia or lymphoma
• ATCS  anterior tibial compartment syndrome
• ATD  Alzheimer-type dementia; androstatrienedione; anthropomorphic test dummy; antithyroid drug; aqueous tear deficiency; asphyxiating thoracic dystrophy
• ATDC  Association of Thalidomide Damaged Children
• ATDNet  Advanced Technology Demonstration Network
• ATDP  Attitude Toward Disabled Persons [scale]
• ATE  acute toxic encephalopathy; acute toxicity end point; adipose tissue extract; autologous tumor extract
• ATEE  N-acetyl-1-tyrosyl-ethyl ester
• ATEM  analytic transmission electron microscopy
• Aten  atenolol
• ATEST  Atenolol and Streptokinase Trial
• ATEV  Aphodius tasmaniae entomopoxvirus
• ATF  activating transcription factor; anterior talofibular [ligament]; ascites tumor fluid
• At fib  atrial fibrillation
• ATG  adenine-thymidine-guanine; advanced technology group; antihuman thymocyte globulin; antithrombocyte globulin; antithymocyte globulin; antithyroglobulin
• ATGAM  antithymocyte gamma-globulin
• AT/GC  adenine-thymine/guanine-cytosine [ratio]
• ATH  acetyl-tyrosine hydrazide; alkylated thiohydantoin
• ATh  Associate in Therapy
• Athsc  atherosclerosis
• AtHV  ateline herpesvirus
• ATI  abdominal trauma index; attitude-treatment interaction
• ATIAIS  Anturane Transient Ischemic Attack Italian Study
• ATIME  Accupril Titration Interval Management Evaluation [trial]
• ATL  Achilles tendon lengthening; active template library; acute T-cell leukemia; adult T-cell leukemia; anterior tricuspid leaflet; antitension line; atypical lymphocyte
• ATLA  adult T-cell leukemia virus-associated antigen; alternatives to laboratory animals
• ATLANTIC  Angina Treatment, Lasers, and Normal Therapy in Comparison [trial]
• ATLANTIS  Alteplase Thrombolysis for Acute Noninterventional Therapy in Ischemic Stroke

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