<unk> , also commonly called stomach pumping or<unk>  irrigation, is the process of cleaning out the contents of the stomach. Since its first recorded use in early 19th century, it has become one of the most routine means of eliminating poisons from the stomach. Such devices are normally used on a person who has ingested a poison or overdosed on a drug such as ethanol. They may also be used before surgery, to clear the contents of the digestive tract before it is opened. Apart from toxicology,<unk>  (or nasogastric<unk>  is sometimes used to confirm levels of bleeding from the upper gastrointestinal tract. It may play a role in the evaluation of hematemesis. It can also be used as a cooling technique for hyperthermic patients.
Gastric lavage
GI cocktail
Impedance–pH monitoring
Enteroscopy
Electrogastrogram
Upper gastrointestinal series
Oral food challenge
Esophageal pH monitoring