Diagnosis of gastrointestinal bleeding by means of special tube.
D004864:Equipment and Supplies; D005762:Gastroenterology / Q000600:supply & distribution*; D006471:Gastrointestinal Hemorrhage / Q000175:diagnosis*; D006470:Hemorrhage; D006801:Humans
GASTROENTEROLOGY/equipment and supplies; HEMORRHAGE, GASTROINTESTINAL/diagnosis