whereas the list is expanding of normal and abnormal structures which can interfere with the interpretation of scintigraphic gastrointestinal bleeding studies accomplished with 99mtc-labeled erythrocytes , it is absolutely necessary to demonstrate intestinal transit of the activity , in order to discount detected activity in either nonhemorrhagic lesions or normal structures as the nidus of suspected bleeding .
C0017181
gastrointestinal bleeding
C0019080
bleeding