A member asked:

Will magnesium supplement (400mg) cause a false negative reaction on gfobt guaiac hemoccult stool occult blood test? thank you very much for your time and expertise?

A doctor has provided 1 answer
Dr. Sue Ferranti answered

Specializes in Internal Medicine

A magnesium supplement will not affect the stool test for occult blood. It will not cause a false negative or a false positive test. See a GI doctor if there is any question about your test result. Good luck to you!

Answered 3/13/2023

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