Wallach's Interpretation of Diagnostic Tests: Pathways to Arriving at a Clinical Diagnosis (1202 page)

   
Glutethimide:
gas chromatography, GC/MS, liquid chromatography, LC/ MS; measure parent and active metabolite hydroxyglutethimide

   
Methaqualone:
immunoassay screening test available for this agent

   Target analyte—methaqualone

   Cutoff concentration (urine)]—300 ng/mL

   Confirmation by gas chromatography, GC/MS, liquid chromatography, LC/MS: limit of quantitation: 50–200 ng/mL

   
Meprobamate

   Older CNS depressant

   Metabolite of muscle relaxant carisoprodol

   No immunoassay-based screening tests available

   Readily extracted in acidic neutral liquid–liquid or solid-phase extraction scheme: GC, GC/MS, liquid chromatography, LC/MS; limit of quantitation: 500–1,000 ng/mL

   
Buspirone

   Newer antianxiety drug

   No immunoassay-based screening tests available