| APD | APD - Automated Peritoneal Dialysis - a treatment for patients with severe chronic kidney disease. The process uses the patient's peritoneum in the abdomen as a membrane across which fluids and dissolved substances (electrolytes, urea, glucose, albumin and other small molecules) are exchanged from the blood. | |
| APHAB | APHAB - Abbreviated Profile of Hearing Aid Benefit - The APHAB is a 24-item self-assessment inventory in which patients report the amount of trouble they are having with communication or noises in various everyday situations. | |
| AIDR | AIDR - Artificial intervertebral disc replacement - Artificial disc replacement (ADR), or total disc replacement (TDR), is a type of arthroplasty. It is a surgical procedure in which degenerated intervertebral discs in the spinal column are replaced with artificial devices in the lumbar (lower) or cervical (upper) spine. | |
| AF | A-fib | AF | A-fib - Atrial fibrillation - an abnormal heart rhythm characterized by rapid and irregular beating. The disease increases the risk of heart failure, dementia, and stroke. | |
| AUC | AUROC | AUC - Area under the curve - When using normalized units, the area under the curve (often referred to as simply the AUC, or AUROC) is equal to the probability that a classifier will rank a randomly chosen positive instance higher than a randomly chosen negative one (assuming 'positive' ranks higher than 'negative') | |
| AHI | AI | AHI - Apnoea/Hypopnoea index, Apnoea-Hypopnoea index | AI - Apnoea index - The Apnea–Hypopnea Index or Apnoea–Hypopnoea Index (AHI) is an index used to indicate the severity of sleep apnea. It is represented by the number of apnea (pause in breathing) and hypopnea (disorder which involves episodes of overly shallow breathing) events per hour of sleep. | |
| ABBR | ABBR - Abbreviation - Description | — |