Confirming the Presence of Drugs Using Analytical Methods that Combine Chromatographic Separation with Mass Spectrometric Identification.

Most drugs and metabolic products are excreted in the urine in higher concentrations than in the blood. Urine toxicology screening tests are very sensitive, allowing the detection of small amounts of drugs and drug metabolites. Mass spectrometric methods are the most definitive to verify a drug of abuse and present analysis of a wide array of substances of abuse in an easy-to-read report.