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:
Last Revised: September 9, 2011
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