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When testing for drugs, what are the differences between hair testing cut-off levels and urine testing cut-off levels?

April 26, 2017Cut-Off differences drugs hair levels Testing urine

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When testing for drugs, what are the differences between hair testing cut-off levels and urine testing cut-off levels?

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Urine cut-off levels are expressed in nanograms per milliliter (ng/mL) or as a weight of drug per unit volume of urine. Hair cut-off levels are expressed in picograms per milligram (pg/mg) or as a weight of drug per unit weight of hair.