What is the role of a complete blood cell (CBC) count in the workup of fever of unknown origin (FUO)?

Updated: May 17, 2021
  • Author: Sandra G Gompf, MD, FACP, FIDSA; Chief Editor: Michael Stuart Bronze, MD  more...
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Eosinophilia may suggest polyarteritis nodosa, drug fever, or visceral leishmaniasis.

Acute drop in hemoglobin or hematocrit may suggest occult hemorrhage or hematoma (often retroperitoneal).

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