| A | assessment |
| a | before |
| A/O | alert and oriented |
| A-fib; a-fib | atrial fibrillation |
| A-flutter; a-flutter | atrial flutter |
| A-line | arterial line |
| A-Tach | atrial tachycardia |
| A-V | arteriovenous |
| AAA | abdominal aortic aneurysm |
| AAROM | active assistive range of motion |
| ABC | airway, breathing and circulation |
| Abd; abd | abdomen, abdominal |
| ABI | acquired brain injury |
| ABG | arterial blood gas |
| ac | before meals |
| AC joint | acromioclavicular joint |
| ACL | anterior cruciate ligament |
| ACTH | adrenocorticotropic hormone |
| Add; add | adduction |
| ADL | activities of daily living |
| ad lib | at discretion |
| adm | admission, admitted |
| AE | above elbow |
| AFO | ankle foot orthosis |
| AIDS | acquired immune deficiency syndrome |
| AIIS | anterior inferior iliac spine |
| AJ | ankle jerk |
| AK | above knee |
| AKA | above knee amputation |
| ALOC | altered level of consciousness |
| ALS | advanced l
|