Validation of the Cozart® Amphetamine Microplate EIA for the analysis of amphetamines in oral fluid
Abstract
The purpose of this study was to determine the performance characteristics of the Cozart® Amphetamine Microplate EIA for detecting amphetamine in oral fluid. Oral fluid samples were collected using the Cozart® RapiScan Collection System from 135 volunteer donors from drug treatment clinics. A further 35 oral fluid samples were collected from volunteer donors who were not drug users. The samples were analyzed in the laboratory using the Cozart® Amphetamine Microplate EIA and confirmed using gas chromatography–mass spectrometry (GC–MS). The samples were stored frozen until analysis by GC–MS. The intra-assay precision for the Cozart® Amphetamine Microplate EIA for amphetamine in oral fluid over forty assays was 2.74–7.1% CV (within assay) and 3.4–7.0% CV (within day). A total of 78 samples were positive for various amphetamines and related designer drugs. The Cozart® Amphetamine Microplate EIA, using a cutoff of 45
ng/ml amphetamine equivalents in neat oral fluid, had a sensitivity of 91.7
±
3.3% and a specificity of 95.9
±
1.9% versus GC–MS using a cutoff of 30
ng/ml. A series of potential adulterants of oral fluid were evaluated and shown not to alter the outcome of the test result.
Keywords: Oral fluid, Saliva, Amphetamine, Immunoassay
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PII: S0379-0738(05)00396-8
doi:10.1016/j.forsciint.2005.06.011
© 2005 Elsevier Ireland Ltd. All rights reserved.
