Analytical and technical aspects of testing for drug abuse: confirmatory procedures.

摘要: Many laboratories are now performing urine drug testing for employers, governmental agencies, and other institutions. It is recognized that presumptive positive screening results have to be confirmed by an analytical procedure based on a different chemical technique with greater than or equal sensitivity the test. Thin-layer chromatography has been widely used this; however, it relatively insensitive certain drugs, cannot satisfy accuracy precision requirements needed determine threshold concentrations reliably. Gas chromatography-mass spectrometry able these become method of choice confirming initial immunoassay results.