Question of the Day – Tuesday March 6, 2018

Question- Which drugs and chemicals have been reported to cause false positive urine immunoassay screen results for PCP?

Answer- False positive urine immunoassay screen results for PCP have been reportedly caused by dextromethorphan, diphenhydramine, ibuprofen, imipramine, ketamine, venlafaxine, meperidine, thioridazine, and tramadol. (Mahajan G. Role of urine drug testing in the current opioid epidemic. 2017 Anesth Analgesia 125(6):2094-2104)