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Common Test-Ordering Errors
Part 7: Overordered Microbiology Tests

Helicobacter pylori IgM
Stool Ova & Parasites

H pylori IgM (and IgA) Not Useful

Slide 6

October 2010

Regarding serology tests, because H pylori is a chronic infection, by the time symptoms occur, the infection has been present for some time and, therefore,  IgG is consistently positive. Furthermore,  a negative IgM does not rule-out active infection. That is, patients with active infection can have negative IgM results.  Also, IgM levels should not be used as a test of cure, as the IgM may remain positive despite eradication of the organisms.  Consequently, the use of IgM (or IgA for that matter) adds little to the assessment.

H pylori IgM (and IgA) Not Useful


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