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A member asked:
My question is what causes a not positive and not negative drug test?
A doctor has provided 1 answer
Don't understand ?: "not positive" and "not negative" can mean what is called an "indeterminate" test, which can mean that the test was just at the cut-off that the test uses for a positive - the cut-off for thc is (say) 50 ng/ml and the test comes out 48 ng/ml, that particular test may give a signal that it is indeterminate. It may also indicate interfering substances, water loading or other things.
Answered 2/23/2014
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