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Dictionary of medical acronyms abbreviations 6th edition

ABBREVIATIONS - 6th Ed. (2009)
Front Matter
Title Page
Jablonski's Dictionary of Medical Acronyms & Abbreviations
6th Edition

Copyright Page

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Jablonski's Dictionary of Medical Acronyms & Abbreviations ISBN: 978-1-4160-5899-1
Copyright © 2009, 2005, 2001, 1997, 1992, 1987 by Saunders, an imprint of Elsevier, Inc.
All rights reserved. No part of this publication may be reproduced or transmitted in any form or by any means,
electronic or mechanical, including photocopying, recording, or any information storage and retrieval system,
without permission in writing from the publisher. Permissions may be sought directly from Elsevier's Rights
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Library of Congress Cataloging-in-Publication Data
Jablonski's dictionary of medical acronyms & abbreviations. - 6th ed.
p. ; cm.
Rev. ed. of: Dictionary of medical acronyms & abbreviations / compiled and edited by
Stanley Jablonski. c2005.
ISBN 978-1-4160-5899-1
1. Medicine-Abbreviations-Dictionaries. 2. Medicine-Acronyms-Dictionaries.
I. Jablonski, Stanley. II. Dictionary of medical acronyms & abbreviations. III. Title:
Jablonski's dictionary of medical acronyms and abbreviations. IV. Title: Dictionary
of medical acronyms & abbreviations.
[DNLM: 1. Medicine-Abbreviations. 2. Medicine-Dictionary-English.
W 13 J131 2009]
R123.J24 2009

Chief Lexicographer: Douglas M. Anderson
Assistant Lexicographer: Michelle A. Elliott
Publishing Services Manager: Linda Van Pelt
Project Manager: Francisco Morales
Design Direction: Gene Harris
Multimedia Producer: Adrienne Simon
Marketing Manager: Allan McKeown
Printed in USA

Last digit is the print number: 9 8 7 6 5 4 3 2 1
ISBN-13: 978-1-4160-5899-1
ISBN-10: 1-41605-899-0

In memory of Stanley Jablonski, for whom this work was a labor of love for many years.

Preface to the 6th Edition
This sixth edition of Jablonski's Dictionary of Medical Acronyms & Abbreviations is the first to be published without
the tireless work of Stanley Jablonski, who passed away just before the publication of the fifth edition. The book
has been extremely well received over the years, and the author's enthusiasm and love of medical vocabulary in
all its forms, even maddeningly obscure abbreviations, are evident in its pages. The task of maintaining this
volume now falls to the staff of the Dorland's dictionaries, who are well aware of the tradition of excellence that
they have inherited.

Although responsibility for maintaining the text has changed, the book itself remains the familiar, convenient little
volume that has served users well for two decades. The book retains its format of boldface abbreviations followed
by run-in meanings, a device that enables it to encompass as many entries as larger, heavier books in an easyto-handle size. The list of symbols, which has been expanded for this edition, is in its usual place at the front of
the book. The listings for organizations have been updated: new ones have been added; name changes have been
incorporated; outdated names have been cross-referenced to new ones (or dropped, when thoroughly obsolete, to
make room for new material). Abbreviations and acronyms are included in a single alphabetically arranged section
(no need to flip through multiple sections) and several thousand new entries have been added. The CD-ROM that
accompanies this book has been improved from that of the previous edition—it is searchable for both
abbreviations and meanings, which will greatly increase its usefulness.
As has been noted by many, the convenience of using acronyms and abbreviations can be outweighed by the
danger in doing so. In some cases, ambiguity in interpretation can lead to situations in which patient safety may
be compromised. For this reason, the Joint Commission (JCAHO) has created a list of abbreviations that are
considered dangerous and should not be used in a health care setting. The abbreviations included in this edition
have been compared with the JCAHO "Do not use" list, and those that occur on this list are so identified.
The new editors of Jablonski's Dictionary of Medical Acronyms & Abbreviations would like to express our
admiration for the work that has been handed down to us and also our determination to maintain the book's high
standards going forward. Because new acronyms and abbreviations are constantly being coined, this volume can
never really be complete. We invite you to submit your suggestions for the next edition. You can do this by going
to the Internet site http://www.dorlands.com and clicking on "Suggest a Word." Just tell us that it is for
Jablonski. You can be sure that your contributions will be much appreciated.
Chief Lexicographer

The publisher would like to thank Christopher Peterson, MD, PhD, of Rio de Janeiro, Brazil, for his continuing

interest in the book and for supplying several hundred new entries for this sixth edition. The work of Tsung O.
Cheng, MD, of Washington, DC, was extremely useful for verifying acronyms for cardiology trials and is gratefully
acknowledged: Cheng TO: Acronyms of Clinical Trials in Cardiology—1998. American Heart Journal 137:726-765,

Preface to First Edition
Acronyms and abbreviations are used extensively in medicine, science and technology for good reason—they are
more essential in such fields. It would be difficult to imagine how one could write down chemical and
mathematical formulas and equations without using abbreviations or symbols. In medicine, they are used as a
convenient shorthand in writing medical records, instructions, and prescriptions, and as space-saving devices in
printed literature. It is easier and more economical to write down the acronyms HETE and RAAS than their full
names 12-L-hydroxy-5,8,10,14-eicosatetraenoic acid and renin-angiotensin-aldosterone system, respectively.
The main reason for abbreviations is said to be economy. Some actually save space in print, such as acronyms for
the names of institutions and organizational units, as well as being convenient to use. Many are used for other
reasons, as for instance, when trying to be delicate, we may euphemistically refer to bowel movement as BM, an
unprincipled individual as SOB, and body odor as BO. Also, it is sometimes difficult to fathom the reasoning of
bureaucratic acronym makers, who have created some tongue-twisting monstrosities, such as ADCOMSUBORDCOMPHIBSPAC (for Administrative Command, Amphibious Forces, Pacific Fleet, Subordinate Command).
Abbreviations and acronyms used in medicine can be grouped into two broad categories. The first consists of
official abbreviations and symbols used in chemistry, mathematics, and other sciences, and those designating
weights and measures, whose exact form, capitalization, and punctuation have been determined by official
governing bodies. In this category, they mean only one thing (e.g., kg is the symbol for kilogram and Hz for
hertz), and their form, capitalization, and punctuation have been established by the International System of Units
(Systeme International d'Unites). Abbreviations in the second group, on the other hand, may appear in a variety
of forms, the same abbreviation having a different number of letters, sometimes capitalized, at other times not,
with or without punctuation. Moreover, they may also have numerous meanings. The abbreviation AP may mean
alkaline phosphatase, acid phosphatase, action potential, angina pectoris, and many other things.
Editors of individual scientific publications make an effort to standardize the form of abbreviations and symbols in
their journals and books, but they generally vary from one publication to another.
This dictionary lists acronyms and abbreviations occurring with a reasonable frequency in the medical literature
that were identified by a systematic scanning of collections of books and periodicals at the National Library of
Medicine. Except as they take the form of Greek letters, pure geometric symbols are not included. Although we
have attempted to be as inclusive as possible, a book such as this one can never be complete, in spite of the
most diligent effort, and it is expected that some abbreviations and acronyms may have escaped detection and
others may have been introduced since completion of the manuscript.

Preface to the Sixth Edition… vii
Preface to the First Edition… ix
Symbols… xii
A-Z Acronyms and Abbreviations… 1

The Greek Alphabet

Symbols Commonly Used in Pedigrees

Mathematics and Statistics

Miscellaneous Symbols

Copyright © 2009 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

A  abnormal; abortion; absolute temperature; absorbance; acceptor; accommodation; acetone; acetum;
achondroplasia; acid; acidophil, acidophilic; acromion; actin; Actinomyces; activity [radiation]; adenine; adenoma;
adenosine; admittance; adrenalin; Adriamycin; adult; age; akinetic; alanine; albino [guinea pig]; albumin;
allergologist, allergy; alpha [cell]; alveolar gas; ambulation; ampere; amphetamine; ampicillin; amplitude;
anaphylaxis; androsterone; anesthetic; angstrom, Angstrom unit; anode; Anopheles; antagonism; anterior;
antibody; antrectomy; apical; aqueous; area; argon; artery [Lat. arteria]; atomic weight; atrium; atropine;
auricle; auscultation; axial; axilla, axillary; before [Lat. ante]; blood group A; ear [Lat. auris]; mass number;
subspinale; total acidity; tumor limited to the bowel [Dukes classification]; tumor limited to the mucosa [AstlerColler classification]; water [Lat. aqua]; year [Lat. annum]
A [band]  the dark-staining zone of a striated muscle
A1  aortic first sound; prostatic tumor less than 5% [Jewett staging system]
A 1  aortic first sound
A-1, 2, 3, 4, 5  anterior cerebral artery segments 1, 2, 3, 4, 5
AI, AII, AIII  angiotensin I, II, III
A2  prostatic tumor more than 5% [Jewett staging system]
A 2  aortic second sound
A  Angstrom unit
A  cumulated activity; antinuclear antibody
a  absorptivity; acceleration; accommodation; acidity; activated; ampere; anode; anterior; area; arterial blood;
arterial; artery [Lat. arteria]; atto-; autopsy; before [Lat. ante]; thermodynamic activity; total acidity; water [Lat.
a-  atto- [10 -18]
a sample y intercept of straight line
a  before [Lat. ante]
α see alpha
AA  abampere; abdominal aorta; acetabular anteversion; acetic acid; achievement age; active alcoholic; active
assistive [range of motion]; active avoidance; acupuncture analgesia; acute appendicitis; adenine arabinoside;
adenylic acid; adjuvant arthritis; adrenal androgen; adrenocortical autoantibody; African American; aggregated
albumin; [bacterial] aggregative adherence; agranulocytic angina; alcohol abuse; Alcoholics Anonymous; allergic
alveolitis; alopecia areata; alveolo-arterial; aminoacetone; amino acid; aminoacyl; amyloid A; anaplastic
astrocytoma; anti-arrhythmic agent; anticipatory avoidance; antigen aerosol; aortic amplitude; aortic aneurysm;
aortic arch; aplastic anemia; arachidonic acid; arteries; ascending aorta; atlanto-axial; atomic absorption;
Australia antigen; autoanalyzer; automobile accident; axonal arborization
2AA  2-aminoanthracene
A&A  aid and attendance; awake and aware
A-a  alveolar-arterial; alveolar-atrial
aA  abampere

aa  amino acid; arteries [Lat. arteriae]
AAA  abdominal aortic aneurysm/aneurysmectomy; acne-associated arthritis; acquired aplastic anemia; acute
anxiety attack; alacrima-achalasia-addisonianism [syndrome]; American Academy of Addictionology; American
Academy of Allergy; American Association of Anatomists; androgenic anabolic agent; aneurysm of ascending
aorta; angiography of abdominal aorta; Area Agency on Aging; aromatic amino acid; arrest after arrival
AAAA  American Academy of Anesthesiologist Assistants
AAAAI  American Academy of Allergy Asthma and Immunology
AAAASF  American Association for Accreditation of Ambulatory Surgical Facilities
AAAD  aromatic amino acid decarboxylase
AA/AD  alcohol abuse/alcohol dependence
AAAE  amino acid activating enzyme
AAAHC  Accreditation Association for Ambulatory Health Care
AAAHE  American Association for the Advancement of Health Education
AAAI  American Academy of Allergy and Immunology; American Association of Artificial Intelligence
AAALAC  Association for Assessment and Accreditation of Laboratory Animal Care International
AAAM  Association for the Advancement of Automotive Medicine
AAAS  American Association for the Advancement of Science
AAASPS  African-American Antiplatelet Stroke Prevention Study
AAAV  avian adeno-associated virus
AAB  American Association of Bioanalysts; aminoazobenzene
AABB  American Association of Blood Banks; axis-aligned bounding boxes
AABCC  alertness (consciousness), airway, breathing, circulation, cervical spine
AABH  Association for Ambulatory Behavioral Healthcare
AABS  automobile accident, broadside
AABV  Ascogaster argentifrons bracovirus
AAC  antibiotic-associated [pseudomembranous] colitis; antimicrobial agent-induced colitis; augmentative and
alternative communication
AACA  acylaminocephalosporanic acid; American Association of Clinical Anatomists
AACAP  American Academy of Child and Adolescent Psychiatry
6´AAC-2″APH  6´-acetyltransferase-2″-phosphotransferase
AACC  American Association for Clinical Chemistry
AACCN  American Association of Critical Care Nurses

AACD  aging-associated cognitive decline
AACE  acute acquired comitant esotropia; American Association of Clinical Endocrinologists
AACEM  Association of Academic Chairs in Emergency Medicine
AACG  acute angle closure glaucoma
AACH  American Academy on Communication in Healthcare
AACHP  American Association for Comprehensive Health Planning
AACIA  American Association for Clinical Immunology and Allergy
AACN  American Association of Colleges of Nursing; American Association of Critical-Care Nurses
AACOM  American Association of Colleges of Osteopathic Medicine
AACP  American Academy of Cerebral Palsy; American Association of Colleges of Pharmacy; American Association
of Community Psychiatrists
AACPDM  American Academy for Cerebral Palsy and Developmental Medicine
AACS  American Academy of Cosmetic Surgery
AACSH  adrenal androgen corticotropic stimulating hormone
AACT  American Academy of Clinical Toxicology
AACVPR  American Association of Cardiovascular and Pulmonary Rehabilitation
AAD  acute agitated delirium; acute aortic dissection; alcohol abuse or dependence; alloxazine adenine
dinucleotide; alpha 1-antitrypsin deficiency; American Academy of Dermatology; antiarrhythmic drug; antibioticassociated diarrhea; aromatic acid decarboxylase; average absolute deviation
7-AAD  7-amino-actinomycin D
AADC  amino acid decarboxylase; L-aromatic amino acid decarboxylase
AADE  American Association of Dental Editors; American Association of Dental Examiners
AADGP  American Academy of Dental Group Practice
AADH  alopecia-anosmia-deafness-hypogonadism [syndrome]
(A-a)D N 2   alveolar-arterial nitrogen tension difference
AaDNV  Aedes aegypti densovirus
aAD O 2 , (a-A) DO 2   arterial-alveolar oxygen tension difference
AADP  amyloid A-degrading protease
AADPA  American Academy of Dental Practice Administration
AADS  American Academy of Dental Schools
AAE  active assistive exercise; acute allergic encephalitis; American Association of Endodontists; annuloaortic

AAEE  American Association of Electromyography and Electrodiagnosis
AAEM  American Academy of Emergency Medicine; American Academy of Environmental Medicine; American
Association of Electrodiagnostic Medicine
AAEV  Aedes aegypti entomopoxvirus
AA ex  active assistive exercise
AAF  acetylaminofluorine; aggregative adherence fimbriae; aortic arch flush; ascorbic acid factor
2-AAF  N-2-fluorenylacetamide
AAFP  American Academy of Family Physicians; American Academy of Family Practice
AAFPRS  American Academy of Facial Plastic and Reconstructive Surgery
AAFT  amplitude-adjusted Fourier transform
AAG  3-alkaladenine deoxyribonucleic acid glycosylase; allergic angiitis and granulomatosis; alpha-1-acid
glycoprotein; alveolar arterial gradient; autoantigen
17AAG  17-allylamino-17-demethoxygeldanamycin
AAGL  American Academy of Gynecologic Laparoscopists
AAGP  American Academy of General Practice; American Association for Geriatric Psychiatry
AAH  Academy of Architecture for Health
AAHA  American Academy of Hospital Attorneys; American Association of Homes for the Aging
AAHC  American Accreditation Health-Care Commission; American Association of Healthcare Consultants;
Association of Academic Health Centers
AAHD  American Association of Hospital Dentists
AAHE  Association for the Advancement of Health Education
AAHP  American Association of Health Plans
AAHPER  American Association for Health, Physical Education, and Recreation
AAHRPP  Association for the Accreditation of Human Research Protection Programs
AAHS  American Association for Hand Surgery
AAHSA  American Association of Homes and Services for the Aging
AAHSL  Association of Academic Health Sciences Libraries
AAHSLD  Association of Academic Health Sciences Library Directors
AAI  acute alveolar injury; activator adjusting instrument; Adolescent Alienation Index; American Association of
Immunologists; atrial inhibited [pacemaker]
AAIB  alpha 1-aminoisobutyrate
AAID  American Academy of Implant Dentures

AAIDD  American Association on Intellectual and Developmental Disabilities
AAIN  American Association of Industrial Nurses
AAK  allo-activated killer
AAKP  American Association of Kidney Patients
AAL  ambient air level; anterior axillary line
AALAS  American Association of Laboratory Animal Science
AALib  amino acid library
AALL  American Association for Labor Legislation
AALNC  American Association of Legal Nurse Consultants
AAM  acute aseptic meningitis; American Academy of Microbiology; amino acid mixture
AAm  acrylamide
AAMA  American Academy of Medical Administrators; American Association of Medical Assistants
AAMC  American Association of Medical Clinics; Association of American Medical Colleges
AAMD  American Academy of Medical Directors
AAME  acetylarginine methyl ester
AAMFT  American Association for Marriage and Family Therapy
AAMI  Association for the Advancement of Medical Instrumentation
AAMIH  American Association for Maternal and Infant Health
AAMMC  American Association of Medical Milk Commissions
AAMP  American Academy of Maxillofacial Prosthetics
AAMR  American Academy of Mental Retardation
AAMRL  American Association of Medical Record Librarians
AAMRS  automated ambulatory medical record system
AAMS  acute aseptic meningitis syndrome; Association of Air Medical Services
AAMSE  American Association of Medical Society Executives
AAMSI  American Association for Medical Systems and Informatics
AAMT  American Association for Medical Transcription
AAMU  5-acetylamino-6-amino-methyluracil
AAN  AIDS-associated nephropathy; alpha-amino nitrogen; American Academy of Neurology; American Academy
of Nursing; American Academy of Nutrition; American Association of Neuropathologists; amino acid nitrogen;
analgesicassociated nephropathy; attending's admission notes

AANA  American Association of Nurse Anesthetists
AANE  American Association of Nurse Executives
AANEM  American Association of Neuromuscular & Electrodiagnostic Medicine
AANM  American Association of Nurse-Midwives
AANN  American Association of Neuroscience Nurses
AANP  American Academy of Nurse Practitioners; American Association of Naturopathic Physicians; American
Association of Neuropathologists
AANPI  American Association of Nurses Practicing Independently
AAO  American Academy of Ophthalmology; American Academy of Optometry; American Academy of Osteopathy;
American Academy of Otolaryngology; American Association of Ophthalmologists; American Association of
Orthodontists; amino acid oxidase; ascending aorta; awake, alert, and oriented
AAo  ascending aorta
A-a O 2  alveolar-arterial oxygen gradient; alveolar-arterial oxygen tension
AAOC  antacid of choice
AAofA  Ambulance Association of America
AAOHN  American Association of Occupational Health Nurses
AAO-HNS  American Academy of Otolaryngology-Head and Neck Surgery
AAOM  American Academy of Oral Medicine
AAOMP  American Academy of Oral and Maxillofacial Pathology
AAOMR  American Academy of Oral and Maxillofacial Radiology
AAOMS  American Association of Oral and Maxillofacial Surgery
AAOO  American Academy of Ophthalmology and Otolaryngology
AAOP  American Academy of Oral Pathology
AAOPP  American Association of Osteopathic Postgraduate Physicians
AAOS  American Academy of Orthopaedic Surgeons; American Association of Osteopathic Specialists; American
Association of Orthopaedic Surgeons
AAP  acute abdominal pain; acute appendicitis; air at atmospheric pressure; American Academy of Pediatrics;
American Academy of Pedodontics; American Academy of Periodontology; American Academy of Psychoanalysts;
American Academy of Psychotherapists; American Association of Pathologists; Association for the Advancement of
Psychoanalysis; Association for the Advancement of Psychotherapy; Association of Academic Physiatrists;
Association of American Physicians
AAPA  American Academy of Physician Assistants; American Association of Pathologists' Assistants
AAPB  American Association of Pathologists and Bacteriologists; Association for Applied Psychophysiology and
AAPBD  anomalous arrangement of the pancreaticobiliary duct

AAPC  American Academy of Professional Coders; antibiotic-associated pseudomembranous colitis; average
annual percent change
AAPCC  adjusted annual per capita cost; adjusted average per capita costs; American Association of Poison
Control Centers
AaP CO 2 , (A-a)P CO 2   alveolar-arterial carbon dioxide tension difference
AAPD  American Academy of Pediatric Dentistry
AAPF  anti-arteriosclerosis polysaccharide factor
AAPH  2,2´-azobis-(2-amidinopropane) hydrochloride
AAPHD  American Association of Public Health Dentistry
AAPHP  American Association of Public Health Physicians
AAPL  American Academy of Psychiatry and the Law
AAPM  American Association of Physicists in Medicine; American Academy of Pain Medicine
AAPMC  antibiotic-associated pseudomembranous colitis
AAPM&R  American Academy of Physical Medicine and Rehabilitation
AaP O 2 , (A-a) P O 2   alveolar-arterial oxygen tension difference
AAPP  American Academy on Physician and Patient
AAPPO  American Association of Preferred Provider Organizations
AAPS  American Academy of Phalloplasty Surgeons; American Association of Pharmaceutical Scientists; American
Association of Plastic Surgeons; Arizona Articulation Proficiency Scale; Association of American Physicians and
AAPT  Adolescent Alcohol Prevention Trial
AAR  active avoidance reaction; acute articular rheumatism; antigen-antiglobulin reaction
aar  against all risks
AARC  American Association for Respiratory Care
AARE  automobile accident, rear end
AARIF  arthroscopically assisted reduction and internal fixation
AARNet  Australian Academic and Research Network
AAROM  active assertive range of motion; active-assisted range of motion
AARP  American Association of Retired Persons
AART  American Association for Rehabilitation Therapy
AAS  Aarskog-Scott [syndrome]; acid aspiration syndrome; alcoholic abstinence syndrome; American Academy of
Sanitarians; American Analgesia Society; aneurysm of atrial septum; anthrax antiserum; aortic arch syndrome;
atomic absorption spectrophotometry

AASCIN  American Association of Spinal Cord Injury Nurses
AASD  American Academy of Stress Disorders
aa seq  amino acid sequence
AASH  adrenal androgen stimulating hormone; American Association for the Study of Headache
AASK  African American Study of Kidney Disease and Hypertension Pilot Study
AASP  acute atrophic spinal paralysis; American Association of Senior Physicians; ascending aorta synchronized
AASS  American Association for Social Security
AAST  American Association for the Surgery of Trauma
AAT  Aachen Aphasia Test; academic aptitude test; Accolate Asthma Trial; alanine aminotransferase; alkylating
agent therapy; alpha 1-antitrypsin; atrial triggered [pacemaker]; auditory apperception test; automatic atrial
A 1AT  α 1-antitrypsin
α 1AT  α 1 -antitrypsin
AATB  American Association of Tissue Banks
AATP  American Association for Technology in Psychiatry
AATS  American Association for Thoracic Surgery
AAU  acute anterior uveitis
AAUT  actual amount of use test
AAV  adeno-associated virus
AaV  Acherontia atropas virus; Allomyces arbuscula virus
AAVMC  Association of American Veterinary Medical Colleges
AAVP  American Association of Veterinary Parasitologists
AAW  anterior aortic wall
AB  abdominal; able body; abnormal; abortion; Ace bandage; active bilaterally; aid to the blind; airbag; alcian
blue; alertness behavior; antibiotic; antibody; antigen binding; apex beat; asbestos body; asthmatic bronchitis;
axiobuccal; Bachelor of Arts [Lat. Artium Baccalaureus]; blood group AB
A/B  acid-base ratio
A&B  apnea and bradycardia
A>B  air greater than bone [conduction]
Ab  abortion; antibiotic; antibody
A b  amount in body

aB  azure B
ab  aberration; abortion; antibody; from [Lat.]
3AB  3-aminobenzamide
ABA  abscissic acid; allergic bronchopulmonary aspergillosis; American Board of Anesthesiology; American Burn
Association; antibacterial activity; arrest before arrival; autonomic blocking agent
ABACAS  Adjunctive Balloon Angioplasty Following Coronary Atherectomy Study
ABAI  American Board of Allergy and Immunology
AB/AM  antibiotic/antimycotic
ABAT  American Board of Applied Toxicology
ABAV  Abadina virus
ABB  Albright-Butler-Bloomberg [syndrome]; American Board of Bioanalysis
ABBI  advanced breast biopsy instrument
ABBQ  AIDS Beliefs and Behavior Questionnaire
abbr  abbreviated, abbreviation
ABC  abacavir; absolute basophil count; absolute bone conduction; acalculous biliary colic; acid balance control;
aconite-belladonna-chloroform; adenosine triphosphate [ATP] binding cassette; airway, breathing, and circulation;
alignment, blue, calcium [synovial fluid pearls in gout and pseudogout]; Alpha Beta Canadian [trial]; alternative
birth center; alum, blood, and charcoal [purification and deodorizing method]; alum, blood, and clay [sludge
deodorizing method]; American Blood Commission; aneurysmal bone cyst; antigen-binding capacity; antigenbinding cell; apnea, bradycardia, cyanosis; aspiration biopsy cytology; assessment of basic competency; atomic,
biological, and chemical [warfare]; axiobuccocervical; autism behavior checklist; avidin-biotin peroxidase complex
A&BC  air and bone conduction
ABCA1  ATP-binding cassette A1
ABCC  Atomic Bomb Casualty Commission
ABCD  airway, breathing, circulation, differential diagnosis (or defibrillate) [in cardiopulmonary resuscitation];
amphotericin B colloidal dispersion; appropriate blood pressure control in diabetes; asymmetry, borders are
irregular, color variegated, diameter > 6 mm [biopsy in melanoma]
ABCDE  airway, breathing, circulation, disability, exposure [in trauma patients]; botulism toxin pentavalent
ABCDES  abnormal alignment, bonesperiarticular osteoporosis, cartilage-joint space loss, deformities, marginal
erosions, soft tissue swelling [x-ray features in rheumatoid arthritis]; adjust medication, bacterial prophylaxis,
cervical spine disease, deep vein thrombosis prophylaxis, evaluate extent and activity of disease, stress-dose
steroid coverage [preoperative evaluation in rheumatoid diseases]; alignment, bone mineralization, calcifications,
distribution of joints, erosions, soft tissue and nails [x-ray features in arthritis]; ankylosis, bone osteoporosis,
cartilage destruction, deformity of joints, erosions, swelling of soft tissues [x-ray features of septic arthritis]
ABCIC  airway, breathing, circulation, intravenous crystalloid
ABCIL  antibody-mediated cell-dependent immunolympholysis
ABC-M  chemical-biological aircraft mask

ABCN  American Board of Clinical Neuropsychology
ABCs  Active Bacterial Core Surveillance system
ABD  abdomen; aged, blind, and disabled; aggressive behavioral disturbance; aortic barodenervated [rat];
automatic border detection; automatic boundary detection; average body dose
Abd, abd  abdomen, abdominal; abduct, abduction, abductor
abdom  abdomen, abdominal
ABDPH  American Board of Dental Public Health
ABE  acute bacterial endocarditis; American Board of Endodontics; botulism equine trivalent antitoxin
ABEM  American Board of Emergency Medicine
ABEPP  American Board of Examiners in Professional Psychology
ABER  abducted and externally rotated; auditory brainstem evoked response
aber  aberrant
A-β  amyloid beta-peptide
ABF  aortic blood flow; aortobifemoral
ABG  arterial blood gas; axiobuccogingival
ABGC  American Board of Genetic Counseling
ABHM  Association of Behavioral Healthcare Management
ABHW  Association for Behavioral Health and Wellness
ABI  ankle/brachial index; atherothrombotic brain infarct; auditory brainstem implant
ABIC  Adaptive Behavior Inventory for Children; antibody excess immune complex
ABIM  American Board of Internal Medicine
ABIMCE  American Board of Internal Medicine certifying examination
ABIT  assertive behavior inventory tool
ABK  aphakic bullous keratopathy
ABL  Abelson proto-oncogene; abetalipoproteinemia; acceptable blood loss; acute basophilic leukemia; African
Burkitt lymphoma; Albright-Butler-Lightwood [syndrome]; allograft-bound lymphocyte; angioblastic
lymphadenopathy; antigenbinding lymphocyte; Army Biological Laboratory; automated biological laboratory;
Abl  ablation
ABLB  alternate binaural loudness balance
ABLC  amphotericin B lipid complex
ABLES  Adult Blood Lead Epidemiology and Surveillance

ABM  abamectin; adjusted body mass; alveolar basement membrane; autologous bone marrow
aBMD  areal bone mineral density
ABMG  American Board of Medical Genetics
ABMI  autologous bone marrow infusion
AbMLV  Abelson murine leukemia virus
ABMM  American Board of Medical Management
ABMS  American Board of Medical Specialties
ABMT  American Board of Medical Toxicology; autologous bone marrow transplantation
ABMV  Above Maiden virus; Abu Mina virus
AbMV  Abutilon mosaic virus
AbN  antibody nitrogen
Abn, abn  abnormal; abnormality(ies)
ABNMP  alpha-benzyl-N-methyl phenethylamine
ABNO  anatomic abnormality [UMLS]
abnor  abnormal
ABO  abortion; absent bed occupancy; American Board of Orthodontists; blood group system consisting of groups
A, AB, B, and O
ABODM  American Board of Disaster Medicine
ABOHN  American Board for Occupational Health Nurses
ABOMP  American Board of Oral and Maxillofacial Pathology
ABOMS  American Board of Oral and Maxillofacial Surgery
ABOP  American Board of Oral Pathology
Abor, abor  abortion
ABOS  American Board of Orthopaedic Surgery
ABOVE  Acute Bleeding Oesophageal Variceal Episodes [study]
ABP  actin-binding protein; acute biliary pancreatitis; ambulatory blood pressure; American Board of Pediatrics;
American Board of Pedodontics; American Board of Periodontology; American Board of Prosthodontists;
aminobiphenyl; androgen-binding protein; antigen-binding protein; arterial blood pressure; automatic systolic
blood pressure measurement; avidin-biotin peroxidase
aBP  arterial blood pressure
ABPA  actin-binding protein, autosomal form; allergic bronchopulmonary aspergillosis
ABPC  antibody-producing cell

ABPE  acute bovine pulmonary edema
ABPM  ambulatory blood pressure monitoring
ABPMR  American Board of Physical Medicine and Rehabilitation
ABPS  American Board of Physician Specialties; American Board of Plastic Surgery; American Board of Podiatric
ABQ  attitude behavior questionnaire
ABR  abortus Bang ring [test]; absolute bed rest; American Board of Radiology; arterial baroreflex; auditory
brainstem response
ABr  agglutination test for brucellosis
Abr, Abras  abrasion
ABRV  Abras virus; Arbroath virus
ABS  abdominal surgery; acidic ammonium bisulfate; acute brain syndrome; Adaptive Behavior Scale; admitting
blood sugar; adult bovine serum; aging brain syndrome; alkylbenzene sulfonate; aloin, belladonna, strychnine;
American Board of Surgery; amniotic band sequence; amniotic band syndrome; anti-B serum; Antley-Bixler
syndrome; arterial blood sample; at bedside; Australian Bureau of Statistics
Abs  absorption
abs  absent; absolute
AB-SAAP  autologous blood selective aortic arch perfusion
absc  abscess; abscissa
abs conf  absolute configuration
ABSe  ascending bladder septum
abs feb  while fever is absent
ABSITE  American Board of Surgery In-Training Examination
absorp  absorption
AbSR  abnormal skin reflex
abst, abstr  abstract
ABSV  Absettarov virus
ABT  abstract behavioral type; autologous blood transfusion; lopinavir
abt  about
ABU  asymptomatic bacteriuria
ABV  actinomycin D-bleomycin-vincristine; Agaricus bisporus virus; Aglaonema bacilliform virus; Aransas Bay
virus; arthropod-borne virus
AbV  Agaricus bisporus virus

ABVD  Adriamycin, bleomycin, vinblastine, and dacarbazine
ABW  average body weight
ABX  abciximab; antibiotics
ABY  acid bismuth yeast [medium]
AbYV  Abutilon yellow virus
AC  abdominal circumference; abdominal compression; ablation catheter; abrupt closure; absorption coefficient;
abuse case; acetate; acetylcholine; acidified complement; Acinetobacter calcoaceticus; acromioclavicular; activated
charcoal; acupuncture clinic; acute; acute cholecystitis; adenocarcinoma; adenylate cyclase; adherent cell; adrenal
cortex; adrenocorticoid; Adriamycin/cyclophosphamide; air chamber; air conditioning; air conduction; alcoholic
cirrhosis; alternating current; alveolar crest; ambulatory care; anesthesia circuit; angiocellular; anodal closure;
antecubital; anterior chamber; anterior column; anterior commissure; antibiotic concentrate; anticholinergic;
anticoagulant; anticomplement; antiphlogistic corticoid; aortic closure; aortic compliance; aortocoronary; arm
circumference; ascending colon; assist control [ventilation]; atriocarotid; autocorrelation; axiocervical; hydrogen
cyanide [war gas]
A-C  acromioclavicular; adult-versus-child; aortocoronary bypass
A/C  albumin/coagulin [ratio]; anterior chamber of eye; assist control [ventilation]
A2C  apical two-chamber [view]
A4C  apical four-chamber [view]
Ac  accelerator [globulin]; acetate; acetyl; actinium; anticoagulant, anticoagulation; aortic closure; arabinosyl
aC  abcoulomb; arabinosyl cytosine
ac  acceleration; acetyl; acid; acromioclavicular; acute; alternating current; antecubital; anterior chamber; atrial
contraction; axiocervical
5-AC  azacitidine
ACA  abnormal coronary artery; acrodermatitis chronica atrophicans; acute cerebellar ataxia; adenocarcinoma;
adult child of an alcoholic; American Chiropractic Association; American College of Allergists; American College of
Anesthesiologists; American College of Angiology; American College of Apothecaries; American Council on
Alcoholism; American Counseling Association; aminocephalosporanic acid; ammonia, copper, and acetate;
amyotrophic choreoacanthocytosis; anisotropic conductive adhesive; anterior cerebral artery; anterior
communicating aneurysm [or artery]; anticapsular antibody; anticardiolipin antibody; anticentromere antibody;
anticollagen antibody; anticomplement activity; anticytoplasmic antibody; arrhythmic cardiac arrest; automatic
chemical agent alarm; Automatic Clinical Analyzer
AC/A  accommodative convergence/accommodation [ratio]
ACAAI  American College of Allergy, Asthma and Immunology
ACAC  acetyl-coenzyme A cocarboxylase; activated charcoal artificial cell
ACACN  American Council of Applied Clinical Nutrition
ACACT  acylcoenzyme A:cholesterol acyltransferase
ACAD  asymptomatic coronary artery disease; atherosclerotic carotid artery disease; Azithromycin in Coronary
Artery Disease [study]

Acad  academy
ACADEMIC  Azithromycin in Coronary Artery Disease Elimination of Myocardial Infection with Chlamydia [study]
A-CAH  autoimmune chronic active hepatitis
ACAM  American College for Advancement in Medicine
ACAO  acyl coenzyme A oxidase
ACAPS  Asymptomatic Coronary Artery Plaque Study; Asymptomatic Coronary Artery Progression Study
ACAS  adaptive cluster analysis system
ACASI  audio computer-assisted self interview
ACAT  acetyl coenzyme A acetyltransferase; automated computerized axial tomography
ACAV  Acara virus; American Committee on Arthropod-Borne Viruses
ACB  antibody-coated bacteria; aortocoronary bypass; arterialized capillary blood; asymptomatic carotid bruit
ACBaE  air contrast barium enema
ACBC  aminocyclobutanecarboxylic acid
AC/BC  air conduction/bone conduction [time ratio]
ACBE  air contrast barium enema
ACBG  aortocoronary bypass graft
ACBS  Asymptomatic Cervical Bruit Study
ACC  accommodation; acetyl coenzyme A carboxylase; acinic cell carcinoma; actinomycin C; acute care center;
adenoid cystic carcinoma; administrative control center; adrenocortical carcinoma; agenesis of corpus callosum;
alveolar cell carcinoma; ambulatory care center; American College of Cardiology; anodal closure contraction;
anterior cingulate cortex; antitoxin-containing cell; aplasia cutis congenita; articular chondrocalcinosis; automated
cell count; automated cell counter
Acc  acceleration; adenoid cystic carcinoma
acc  acceleration, accelerator; accident; accommodation
ACCA  Advisory Committee on Casualty Assessment [Canada]; American College of Cardiovascular Administrators
ACC/AHA  American College of Cardiology/American Hospital Association [Task Force]
ACCE  American College of Clinical Engineering
ACCEPT  Accupril Canadian Clinical Evaluation and Patient Teaching; American College of Cardiology
Electrocardiogram Proficiency Test; American College of Cardiology Evaluation of Preventive Therapies [study]
ACCESS  A Comparison of Percutaneous Entry Sites for Coronary Angioplasty; Acute Candesartan Cilexetil
Evaluation in Stroke Survivors; Ambulatory Care Clinic Effectiveness Systems Study; Atorvastatin Comparative
Cholesterol Efficacy and Safety Study; automated cervical cell screening system
ACCH  Association for the Care of Children's Health
AcCh  acetylcholine

AcChR  acetylcholine receptor
AcCHS  acetylcholinesterase
accid  accident, accidental
acc insuff  accommodation insufficiency
ACCISM  Association of City and County Information System Managers
ACCL, Accl  anodal closure clonus
ACCME  Accreditation Council for Continuing Medical Education
ACCN  accession number
AcCoA  acetyl coenzyme A
accom  accommodation
ACCP  Alliance for Cervical Cancer Prevention; American College of Chest Physicians; American College of Clinical
Pharmacology; American College of Clinical Pharmacy
AcCPV  Arctia caja cypovirus
ACCR  amylase-creatinine clearance ratio
ACCS  American-Canadian Cooperative Study
ACCT  Amlodipine Cardiovascular Community Trial; aortic cross-clamp time
accum  accumulation
accur  accurately [Lat. accuratissime]
ACD  absolute cardiac dullness; absolute claudication distance; acid-citrate-dextrose [solution]; actinomycin D;
active compression-decompression; adult celiac disease; advanced care directive; allergic contact dermatitis;
alopecia-contractures-dwarfism [syndrome]; American College of Dentists; ammonium citrate dextrose;
angiokeratoma corporis diffusum; annihilation coincidence detection; anterior chamber depth; anterior chest
diameter; anticoagulant citrate dextrose; anticonvulsant drug; area of cardiac dullness; Available Chemicals
AcDB  A C. elegans Database [gene expression]
AC-DC, ac/dc  alternating current or direct current
ACD-CPR  active compression-decompression cardiopulmonary resuscitation
ACD-PCR  active compression-decompression post-compression remodeling
ACDV  Acado virus
ACE  acetonitrile; acetylcholine esterase; acute cerebral encephalopathy; acute coronary event; adrenocortical
extract; Adverse Childhood Experience [study]; alcohol, chloroform, and ether; analytic continuum electrostatics;
angiotensin-converting enzyme; annealed competition of experts [algorithm]; Aspirin and Carotid Endarterectomy
ace  acentric; acetone

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