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Common Test-Ordering Errors
Part 7: Overordered Microbiology Tests

Helicobacter pylori IgM
Stool Ova & Parasites

Initial Testing in Patients with Watery Diarrhea

Slide 11

October 2010

In brief, for patients with watery diarrhea who have AIDS, have contact with farm animals, or are involved in an outbreak in a municipal water supply, Cryptosporidium antigen testing is recommended as the first test.  For patients with watery diarrhea who are ≤5 years old (or their contacts), are campers, or who are involved in outbreaks in resort communities, Giardia antigen testing is recommended.  In patients with watery diarrhea who are involved in daycare outbreaks, both Crypto and Giardia antigen testing are recommended. Traditional O & P is reserved for patients who are residents or visitors to developing countries or to areas of North America where infections caused by worms are reported with some frequency. We believe that, by following this approach, unnecessary O & P tests can be significantly reduced.

Initial Testing


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