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Concentration of drug metabolites. For example THC (marijuana metabolites) cutoff limit for home drug test is normally 50ng/ml ....mean .. 50 nanograms of THC metabolites per milliliter urine.

Also

1kg = 1000 grams ( 1kg=2.2046 lbs )

1 gram = one billion (1,000,000,000) nanograms.

1l= 1000 ml (1l=33.8140226 fluid ounces )

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Q: What does a cut off level mean in drug testing?
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