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In endoscopy, which is carried out in order to determine the disease in the stomach by inspecting the stomach or carrying out a biopsy, a medical instrument is inserted through the mouth into the stomach, and the instrument is taken out after the procedure. In colonoscopy, which is carried out in order to determine the disease in the colons by inspecting the inside of the intestine or carrying out a biopsy, an instrument is inserted through the anus into the intestines, and the instrument is taken out after the procedure. In colonoscopy, almost always, and in endoscopy generally some water is sent into the body through the instrument in order to clean the area to be inspected.

Although endoscopy, colonoscopy, ultrasound from the anus or vagina do not mean eating or drinking, they invalidate fasting because water is generally sent into the body through the instrument.  However, if water, oil or any other thing that has the quality of food does not enter into digestive system during those procedures, endoscopy, colonoscopy, ultrasound from the anus or vagina will not invalidate fasting.