Why TRBC scintigraphy the preferred modality for detecting lower gastrointestinal (GI) bleeding (LGIB)?

Updated: Jul 26, 2019
  • Author: Burt Cagir, MD, FACS; Chief Editor: BS Anand, MD  more...
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Answer

The TRBC scan is preferred, because its half-life is longer and abdominal images can be obtained for up to 24 hours, which is advantageous in patients with intermittent bleeding. Thus, an advantage of TRBC scanning is in the assessment of intermittent, obscure-overt GI bleeding. [5] TRBC scans detect slow bleeds and have a sensitivity ranging from about 80% to 98%. [49] The bleeding site can be identified accurately when intraluminal accumulation of TRBC is observed during the dynamic phase of scanning, but the site may be less accurately identified if only the still images are reviewed.


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