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Other Tests to Help Detect Giardiasis or Similar Conditions

Other Tests to Help Detect Giardiasis or Similar Conditions

Other tests may be done to help your doctor detect giardiasis or other organisms that may be causing long-term symptoms, especially if problems with malabsorption are occurring.

An upper gastrointestinal (UGI) series or a biopsy of the duodenum often is not specific enough to help in diagnosing giardiasis. But a biopsy may reveal organisms other than Giardia lamblia, such as cryptosporidium or microsporidium, or the presence of a condition such as celiac sprue.

The doctor may collect a sample of fluid or tissue from the duodenum if:

  • A person has low levels of immune proteins in the blood (hypogammaglobulinemia).
  • A person has AIDS and chronic diarrhea, but Giardia lamblia or other parasites are not found in the stool analysis.
  • A person has long-term diarrhea, but prior tests have not determined a cause.
  • Multiple diseases or causes are being considered, and more tests will help clarify the diagnosis.


ByHealthwise Staff
Primary Medical ReviewerE. Gregory Thompson, MD - Internal Medicine
Specialist Medical ReviewerW. David Colby IV, MSc, MD, FRCPC - Infectious Disease
Last RevisedSeptember 9, 2011

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