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A member asked:
I took a drug test, but was on my 1st day of period, so blood mixed in urine, will it affect the results?
5 doctors weighed in across 3 answers
No: It should have no effect on the test for drugs.
Answered 9/29/2016
3.8k views
Should be ok: A bit of blood should not interfere with the drug test. If there is any issue they will contact you for retesting. Good luck
Answered 8/26/2014
3.8k views
Drug tests: Usually blood does not invalidate a drug test. I would read the insert if it was on a home drug test, or ask the technician if you had a test at a commercial testing lab to verify whether blood affects the readings. Usually the quality of tests are good enough that the readings stand on their own.
Answered 8/12/2016
3.8k views
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