Which condition may be identified in a CBC and when is fecal occult blood testing indicated in the workup of constipation?

Updated: Mar 30, 2020
  • Author: Marc D Basson, MD, PhD, MBA, FACS; Chief Editor: BS Anand, MD  more...
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A complete blood (CBC) count may reveal anemia that might be associated with rectal bleeding (gross or occult). Fecal occult blood should be tested in chronically constipated middle-aged or elderly adults to assess an obstructing neoplasm of the colon.

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