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Does a 48ng result on a drug test for marijuana mean it is negative?
Wiki User
∙ 12y ago
It depends on the test.
If you're talking about the pre-GC/MS screen, 50 ng/ml is the Substance Abuse and Mental Health Services Administration (SAMSHA) cutoff so a 48 ng result is just barely negative.
On the GC/MS screen, 15 ng/ml is the cutoff.
However! 48 ng is so close to 50 ng, I think any lab in the world would call it "within the margin of error" and put the sample through GC/MS testing.
Wiki User
∙ 12y ago
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