What is the role of lab testing in the evaluation of giardiasis?

Updated: Oct 01, 2018
  • Author: Hisham Nazer, MBBCh, FRCP, DTM&H; Chief Editor: Burt Cagir, MD, FACS  more...
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Fecal fat quantification or a qualitative fecal fat analysis with Sudan stain may confirm steatorrhea. Serum carotene, folate, and vitamin B-12 levels may be variably depressed as a result of malabsorption. The findings from D-xylose absorption tests may be abnormal.

Disaccharidase deficiency is common during and after treatment and can be diagnosed with the aid of a lactose tolerance breath test. [61]

Serum electrophoresis can help diagnose immunoglobulin A, immunoglobulin M, and, occasionally, immunoglobulin G deficiency states.

Serologic studies are being investigated.

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