title: Failure of glucagon to improve detection of acute gastrointestinal bleeding using technetium-99m red blood cells.
mesh_terms: D004912:Erythrocytes; D005069:Evaluation Studies as Topic; D006471:Gastrointestinal Hemorrhage / Q000000981:diagnostic imaging*; D005934:Glucagon / Q000494:pharmacology; D006801:Humans; D011877:Radionuclide Imaging; D013667:Technetium
chemical_list: D013667:Technetium; D005934:Glucagon