| AAA | Abdominal Aortic Aneurysm | - | Medical(slang) |
| AB | Abortion | - | Medical(slang) |
| ABG | Arterial Blood Gases | - | Medical(slang) |
| AC | Before Meals | - | Medical(slang) |
| AC | Anterior Cephalic Vein | - | Medical(slang) |
| ACE | Angiotensin Converting Enzyme | - | Medical(slang) |
| ACL | Anterior Cruciate Ligament | - | Medical(slang) |
| ACTH | Adrenocorticotropic Hormone | - | Medical(slang) |
| ADA | American Diabetes Association | - | Medical(slang) |
| ADH | Antidiuretic Hormone | - | Medical(slang) |
| ADL | Activities Of Daily Living | - | Medical(slang) |
| ADL | Activities Of Daily Living | - | Medical(slang) |
| AED | Automated External Defibrillator | - | Medical(slang) |
| AF | Atrial Fibrillation | - | Medical(slang) |
| AFA | Advanced First Aid | - | Medical(slang) |
| AFB | Acid-fast Bacilli | - | Medical(slang) |
| AFP | Alpha-fetoprotein | - | Medical(slang) |
| AGA | Appropriate For Gestational Age | - | Medical(slang) |
| AIDS | Acquired Immune Deficiency Syndrome | - | Medical(slang) |
| AKA | Above Knee Amputation | - | Medical(slang) |
| AKF | Acute Kidney Failure | - | Medical(slang) |
| ALP | Alkaline Phosphatase | - | Medical(slang) |
| ALP | Alkaline Phosphatase | - | Medical(slang) |
| ALT | Alanine Transaminase | - | Medical(slang) |
| AMA | Against Medical Advice | - | Medical(slang) |
| AMI | Acute Myocardial Infarction | - | Medical(slang) |
| AODM | Adult Onset Diabetes Mellitus | - | Medical(slang) |
| AP | Apical Pulse | - | Medical(slang) |
| APE | Acute Pulmonary Edema / Acute Pulmonary Embolism | - | Medical(slang) |
| APO | Acute Pulmonary Oedema | - | Medical(slang) |
| APSGN | Acute Poststreptococcal Glomerulonephritis | - | Medical(slang) |
| ARDS | Acute Respiratory Distress Syndrome | - | Medical(slang) |
| ARF | Acute Renal Failure | - | Medical(slang) |
| ARF | Acute Renal Failure | - | Medical(slang) |
| AS | Auricle Sinistrus (Left Ear) | - | Medical(slang) |
| ASAD | Arthroscopic Subacromial Decompression | - | Medical(slang) |
| ASCUS | Atypical Squamous Cells Of Unknown Significance | - | Medical(slang) |
| ASD | Atrial Septal Defect | - | Medical(slang) |
| ASHD | Arteriosclerotic Heart Disease | - | Medical(slang) |
| AST | Aspartate Aminotransferase | - | Medical(slang) |
| ATN | Acute Tubular Necrosis | - | Medical(slang) |
| AU | Both Ears | - | Medical(slang) |
| AV | Atrio-Ventricular (cardiac) | - | Medical(slang) |
| AVB | Atrio-Ventricular Block | - | Medical(slang) |
| AVB | Atrio-ventricular Block | - | Medical(slang) |
