The LSD Rapid Test Cassette (Urine) is a rapid chromatographic immunoassay for the detection of D-Lysergic acid diethylamide (LSD) in human urine. This assay provides only a preliminary analytical test result. A more specific alternate chemical method must be used in order to obtain a confirmed analytical result. Gas chromatography/mass spectrometry (GC/MS) is the preferred confirmatory method. Clinical consideration and professional judgment should be applied to any drug of abuse test result, particularly when preliminary positive results are used.