Kit - Buprenorphine EIA Kit, Small Test Kit The Lin-Zhi International (LZI) Buprenorphine Enzyme Immunoassay, when used in conjunction with Beckman Coulter® Synchron LX®, CX®, and UniCel® DxC automated clinical system analyzers, is intended for the qualitative and semi-quantitative determination of norbuprenorphine (buprenorphine metabolite) in human urine, at a cutoff value of 10 ng/mL. This assay provides a rapid screening procedure for determining the presence of norbuprenorphine (buprenorphine metabolite) in urine. The assay provides only a preliminary analytical result. A more specific alternative chemical method must be used in order to obtain a confirmed analytical result. Chromatography/mass spectrometry (GC/MS or LC/MS) is the preferred confirmatory method (1,2). Clinical consideration and professional judgement should be exercised with any drug of abuse test result, particularly when the preliminary test result is positive.