How to perform gastric lavage/ gastric suction/ stomach pumping
Usually, this procedure is done in emergencies, such as when someone has swallowed poison or overdosed on pills. However, other indications for this procedure include:
to collect a sample of stomach acid
to relieve pressure on blocked intestines
to suction out blood if a stomach hemorrhage occurs
to clean out your stomach if you are vomiting blood during an endoscopy, in which a scope is inserted down your esophagus.