| Abbreviations | Meaning |
 | AAP | Association Of Academic Physiatrists |
| AAP | Association Of American Physicians |
| AAPA | American Academy Of Physician Assistants; American Association Of Pathologist Assistants |
| AAPB | American Association Of Pathologists And Bacteriologists |
| AAPCC | American Association Of Poison Control Centers |
| AAPHD | American Association Of Public Health Dentists |
| AAPHP | American Association Of Public Health Physicians |
| AAPL | American Academy Of Psychiatry And The Law |
| AAPM | American Association Of Physicists In Medicine |
| AAPM&R | American Academy Of Physical Medicine And Rehabilitation |
| AAPP | American Academy On Physician And Patient |
| AAPPO | American Association Of Preferred Provider Organizations |
| AAPS | American Association Of Pharmaceutical Scientists |
| AAPS | American Association Of Plastic Surgeons |
| AAPS | Association Of American Physicians And Surgeons |
| AARC | American Association For Respiratory Care |
| AARP | American Association Of Retired Persons |
| AART | American Association For Rehabilitation Therapy; American Association For Respiratory Therapy |
| AAS | American Analgesia Society |
| AAS | Aarskog-Scott [syndrome]; Acid Aspiration Syndrome; Alcoholic Abstinence Syndrome; American Academy Of Sanitarians |
| AASD | American Academy Of Stress Disorders |
| AASH | Adrenal Androgen Stimulating Hormone; American Association For The Study Of Headache |
| AASP | Acute Atrophic Spinal Paralysis; American Association Of Senior Physicians; Ascending Aorta Synchronized Pulsation |
| AASS | American Association For Social Security |
| AAST | American Association For The Surgery Of Trauma |
| AATB | American Association Of Tissue Banks |
| AATS | American Association For Thoracic Surgery |
| AAVMC | Association Of American Veterinary Medical Colleges |
| AAVP | American Association Of Veterinary Parasitologists |
| ABA | Abscissic Acid; Allergic Bronchopulmonary Aspergillosis; American Board Of Anesthesiologists |
| ABA | American Burn Association; Antibacterial Activity; Arrest Before Arrival; Autonomic Blocking Agent |
| ABAT | American Board Of Applied Toxicology |
| ABB | Albright-Butler-Bloomberg [syndrome]; American Board Of Bioanalysis |
| ABCN | American Board Of Clinical Neuropsychology |
| 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 |
| ABGC | American Board Of Genetic Counseling |
| ABIM | American Board Of Internal Medicine |
| ABIMCE | American Board Of Internal Medicine Certifying Examination |
| ABMG | American Board Of Medical Genetics |
| ABMM | American Board Of Medical Management |
| ABMS | American Board Of Medical Specialties |
| ABMT | American Board Of Medical Toxicology; Autologous Bone Marrow Transplantation |
| ABO | American Board Of Orthodontists |
| ABOHN | American Board For Occupational Health Nurses |
| ABOMS | American Board Of Oral And Maxillofacial Surgery |
| ABOP | American Board Of Oral Pathology |
| ABOS | American Board Of Orthopaedic Surgery |
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