<unk>  is taking a person's temperature by inserting a thermometer into the rectum via the anus. This is generally regarded as the most accurate means of temperature-taking, but some may consider it to be an invasive or humiliating procedure. Thus, it is often used sparingly and primarily on infants, children, or adults for whom taking an oral temperature would risk injury (e.g., an unconscious patient, a post-oral surgery patient, or a person suffering a seizure) or be inaccurate (due to recently ingested liquids or breathing through the mouth).
Rectal thermometry
Fecal pH test
Stool test
Lower gastrointestinal series
Upper gastrointestinal series
Defecography
Enteroscopy
Caloric reflex test