Drug and Alcohol Testing Q&A - 2007

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Re: Phencyclidine-positive at 4 ng

From: Robert Swotinsky MD
Password: orange
Date: 21 Dec 2007
Time: 11:48:09 -0800
Remote Name: 68.184.42.162

Comments

The usual cutoff for urine PCP in workplace testing is 25 ng/mL. The question asks (in part), How reliable is a urine PCP of 4 ng/mL? While I can't quantify the reliability based on the information given, I would offer the caution that the 25 ng/mL PCP cutoff and other standard cutoffs are set in part to assure that the tests are reliable. Results far below those cutoffs are not as reliable.