A member asked:

If a drug test cut off level is 5 ng how much drug would have to be present for it to show with that cut off?

5 doctors weighed in across 2 answers

Depends!: On so many factors...Every drug has a different volume of distribution (whether it's confined to the blood stream or diffuses into the interstitial space, into cells, etc...).

Answered 9/26/2013

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Dr. Carlos Satulovsky answered

Specializes in Psychiatry

Can t tell: Depending on many factors, such as the drug (which one?), your metabolism and the time between the use and the sample. Best way to screen negative is to stay actually clean.

Answered 5/18/2014

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