| ABPA | Allergische bronchopulmonare Aspergillose |
| ABR | American Board of Radiology |
| Abr | Abrasio |
| ABR | Akute Belastungsreaktion |
| abs. | absolut |
| ABU | American Board of Urology |
| ABVD | Chemotherapieschema |
| ABX-EGF | Panitumumab |
| a.c. | vor dem Essen |
| ac | arteriocoronar |
| AC | Arteria carotis |
| AC | Chemotherapiekombination |
| ACA | Anti-Centromer-Antikörper |
| ACA | Akrodermatitis chronica atrophicans |
| acac | Acetylacetonat |
| ACAT | Acyl-CoA:cholesterol Acyltransferase |
| ACB | Arteriocoronarer Bypass |
| ACB | Association of Clinical Biochemists |
| Acc | acceptor |
| ACC | Anteriorer cingulärer Cortex |
| AcCoA | Acetyl-Coenzym-A |
| ACD | Association Canadienne de Dermatologie |
| ACD | Alveolar Capillary Dysplasia |
| ACE | angiotensin converting enzyme |
| ACE | A. carotis externa |
| ACE | Vitamine A, C und E |
| ACG | Acromioclaviculargelenk |
| ACG | American College of Gastroenterology |
| ACh | Acetylcholin |
| AChE | Acetylcholinesterase |