Urine is screened by immunoassay for the presence of drugs. Positive results are confirmed by alternative chromatographic procedures. Drug groups include:
Urine is initially screened for basic drugs (Toxi-Lab TM), barbiturates (AxSYM TM), and for salicylates and ethchlorvinyl (chemical spot tests). Positive findings are confirmed by GC/MS or separately by quantitative serum measurements.