A member asked:

Can menstral blood mixed in a urine sample affect the results of the test?

8 doctors weighed in across 4 answers

Always: It will make it impossible to determine whether there was blood in the urine itself.

Answered 1/1/2016

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It will make the: urine look bloody on the test. Otherwise there should not be significant change in the urine dipstick or urinalysis test. Make sure you have the proper sample to test (mid catch) with.

Answered 5/31/2018

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Yes: The contamination of urine with menstrual blood will invalidate most urine test results. The test should be repeated with a clean catch urine specimen.

Answered 11/16/2015

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Dr. Michael Hulse answered

Specializes in Gynecology

Yes: Most urine samples collected during your period will have blood cells. If it is important to have a clean specimen immediately you could have a specimen using a catheter. Otherwise, just wait until you are not on your period. Hope this helps.

Answered 4/1/2016

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