The diagnosis of acute or chronic GI bleeding and the localization of bleeding site is important clinically. GI bleeding localization has been done with contrast angiography. However, dut to its invasivness & limitation, radionuclide angiography is being widely applicated recently. We have studied in 12 cases of surgically & clinically confirmed GI-bleeding lesion with Tc99m PHYTATE & Tc79m BLOOD POOLING AGENTS. Now we report the significance of radionuclide angiography for detection of GI bleeding in conjugation with clinical history & contrast angiography.