What is the role of Tc sulfur colloid scans in the evaluation of lower gastrointestinal (GI) bleeding (LGIB)?

Updated: Jul 26, 2019
  • Author: Burt Cagir, MD, FACS; Chief Editor: BS Anand, MD  more...
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No preparation is required for99m Tc sulfur colloid. This agent has a very short half-life (2.5-3.5 min), because it is rapidly cleared by the reticuloendothelial system; as a result, images provided by such scans can be taken for the few minutes that the colloid is in circulation. However, these scans may not adequately demonstrate abnormalities in patients with intermittent bleeding. 99mTc sulfur colloid enhances the liver and spleen such that bleeding from both the hepatic flexures and the splenic flexures may be obscured.

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