I had done a lot of research about Urine Drug Testing since I had taken one for new job. I was concerned because I used Benzocaine ointment on a canker sore 2 and 3 days prior to the test. I’m afraid of a false-positive for Cocaine. According to my research, it should NOT cause...
[7]. A study on maternal urine and neonatal hair testing for cocaine showed hair analysis for gestational cocaine exposure had a sensitivity of 88%, specificity of 100%, and positive and negative predictive values of 100% and 85%, respectively[8]. LC–MS/MS methods are also used for ...
Urine benzoylecgonine concentrations remained in excess of 300 ng/mL for 48 h. We conclude that small, oral doses of cocaine, potentially undetectable to the user, may cause positive urine test results for at least 48 h using routine detection methods....
Poklis, Evaluation of two enzyme immu- noassays for the detection of the cocaine metabolite benzoylecgonine in 1398 urine specimens, J. Clin. Lab. Anal. 26 (2012) 130-135.S. Carney, C.E. Wolf, L. Tarnai-Moak, A. Poklis, Evaluation of two enzyme immunoassays for the detection of ...