Washing out of a body cavity, such as the colon or stomach, with water or a medicated solution.

Gastric lavage involves placing a tube through the mouth (orogastric) or through the nose (nasogastric) into the stomach. Toxicants are removed by flushing saline solutions into the stomach, followed by suction of gastric contents.

Gastric lavage has also been commonly called stomach pumping or gastric irrigation. It 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.

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