title: A technique for the preparation of Tc-99m red blood cells for evaluation of gastrointestinal hemorrhage.
abstract: Tc-99m labeled red blood cell (RBC) preparations are gaining wide acceptance in the diagnosis and localization of gastrointestinal bleeding. A major requirement of the radiopharmaceutical is that the percentage of Tc-99m attached to red cells in the injected dose must be extremely high, since free pertechnetate is secreted into the gastrointestinal tract and may obscure a bleeding site. We have developed a combined in vivo/in vitro labeling procedure which is simple and rapid, and which enables the administration of substantial amounts of RBC-bound Tc-99m and minimizes the amount of unbound technetium present. The technique is readily utilizable in any nuclear medicine clinic and requires no investigative pharmaceuticals.
mesh_terms: D002675:Child, Preschool; D004912:Erythrocytes; D006471:Gastrointestinal Hemorrhage / Q000000981:diagnostic imaging*; D006801:Humans; D007553:Isotope Labeling / Q000379:methods*; D008297:Male; D011877:Radionuclide Imaging; D013670:Sodium Pertechnetate Tc 99m; D013667:Technetium / Q000378:metabolism; D013997:Time Factors
chemical_list: D013667:Technetium; D013670:Sodium Pertechnetate Tc 99m