Type or paste a DOI name into the text box. For ultrasound of the gastrointestinal tract in preparation for the examination of the child barium meal test in espionage, see Canary trap.
An upper gastrointestinal series, also called an upper gastrointestinal study or contrast radiography of the upper gastrointestinal tract, is a series of radiographs used to examine the gastrointestinal tract for abnormalities. Various types of barium X-ray examinations are used to examine different parts of the gastrointestinal tract. These include barium swallow, barium meal, barium follow-through, and barium enema. Barium swallow X-ray examinations are used to study the pharynx and esophagus. Barium meal examinations are used to study the lower esophagus, stomach and duodenum. Barium follow through examinations are used to study the small intestine.
Enteroclysis, also called small bowel enema, is a barium X-ray examination used to display individual loops of the small intestine by intubating the jejunum and administering barium sulfate followed by methylcellulose or air. Barium enema examinations are used to study the large intestine and rectum and are classified as lower gastrointestinal series. Barium X-ray examinations are useful tools for the study of appearance and function of the parts of the gastrointestinal tract. Barium sulfate is swallowed, which because it is a radio opaque substance does not allow the passage of X-rays. As a result, areas coated by barium sulfate will appear white on an X-ray film. The passage of barium through the gastrointestinal tract is observed by a radiologist using a fluoroscope attached to a TV monitor.