| Abbreviation | Meaning |
|---|---|
| WAIS(-R) | Wechsler Adult Intelligence Scale (Revised) |
| WAP | wandering atrial pacemaker (see multifocal atrial tachycardia) |
| WAS | Wiskott–Aldrich syndrome |
| WASP | Wiskott–Aldrich syndrome protein |
| WAT | white adipose tissue |
| WBAT | weight bearing as tolerated |
| WBC | white blood cell white blood cell count |
| WBI | whole bowel irrigation |
| WBRT | whole-brain radiotherapy treatment |
| WC | white cells or wheelchair |
| W/C | wheelchair |
| WD | well developed |
| WDL | within defined limits (as per hospital defined policy) |
| WH | well hydrated (not dehydrated or hyperhydrated) |
| WDWN | well developed and well nourished |
| WEE | Western equine encephalitis virus |
| WG | Wegener's granulomatosis (now known as granulomatosis with polyangiitis) |
| WISC-R | Wechsler intelligence scale for children revised |
| WLE | Wide local excision |
| WLS | Weight Loss Surgery |
| WM | white matter |
| WMA | wall motion abnormality (heart condition) |
| WN | well nourished |
| WNL | within normal limits (also: we never looked) |
| W/O w/o | without |
| WOB | Work Of Breathing (as in "normal WOB") |
| WOI | without incident |
| WPW | Wolff–Parkinson–White syndrome |
| WS | Waardenburg syndrome Warkany syndrome water-soluble Werner syndrome West syndrome Williams syndrome Wolfram syndrome |
| WSMW | women who have sex with men and women |
| WSW | women who have sex with women |
| wt | weight (whether human weight or otherwise) |
| w/u | Workup |