99mTc-labeled RBC scintigraphy

99mTc-labeled RBC scintigraphy

Imaging A noninvasive method used to localize slow or intermittent GI hemorrhage, in which RBCs are labeled with 99mTc; images are obtained from the Pt with a gamma camera, which detect RBCs extravasated from the large or small intestine. See Scintigraphy.