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A 32-year-old member asked:

Does weed have any effect on your blood tests?

1 doctor answer2 doctors weighed in
Dr. Gurmukh Singh
Pathology 49 years experience
Depends: Blood tests for weed can detect use of the drug. Weed does not materially affect common lab test results. See this site for more info. http://www.webmd.com/mental-health/marijuana-use-and-its-effects.

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A 63-year-old female asked:

Can weed show up in routine blood tests?

2 doctor answers4 doctors weighed in
Dr. Walter Husar
Neurology 33 years experience
Cannabis is: Not detected in routine blood testing unless your doctor is looking for the use of drugs.
A 34-year-old member asked:

Hi docs, would weed show up in blood tests?

1 doctor answer2 doctors weighed in
Dr. Heidi Fowler
Psychiatry 25 years experience
Yes, it can.: Single use marijuana may be found in blood for 12 to 24 hours. Regular use marijuana may be found in blood for 2 to 7 days.

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Last updated Feb 12, 2021

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