Comparison of fluorescence polarization immunoassay, enzyme immunoassay, and thin-layer chromatography for urine cannabinoid screening. Effects of analyte adsorption and vigorous mixing of specimen on detectability.
Four commercial assays for the screening of cannabinoids in urine were compared. Urine specimens from 93 selected subjects were run by fluorescence polarization immunoassay on the Abbott TDx; by enzyme multiplied immunoassay with two Syva EMIT assays; and by thin-layer chromatography with the TOXI-LAB system (Marion Laboratories). The TDx cannabinoid… (More)