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Labcorp Standard Gcms Confirmation Cut Off Levelforum Create Topic - Who Plays Bigfoot In Tina Fey Commerciallibrary Detail Standard lab cut off is 50 ng/ml unless ordered otherwise. The cut off for marijuana on the screen is 50 ng/ml, which is a composite of all 31 metabolite concentrations. If the sample is below this level the test is over as a passing status. Department of health and human services (hhs). When performing confirmation testing by gc/ms or lc/ms/ms, one or more specific metabolites can be identified, quantified and reported using the applicable confirmation cutoff for a positive.

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