WAnoscopy
WArgon plasma coagulation
WAssisted feeding
WBalloon tamponade
WEndoscopic foreign body retrieval
WEndoscopic retrograde cholangiopancreatography
WGastrostomy
WImpedance–pH monitoring
WLiver support system
WParacentesis
WPeritoneal dialysis
WProctoscopy
WRapid urease test
WSleeve gastrectomy
WUrea breath test