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Hair analysis by immunological methods from the beginning to 2000.

V Spiehler

    Forensic Science International
    |February 26, 2000
    PubMed
    Summary

    Immunoassays for drug testing in hair require specific antibodies and cutoffs to avoid false results. Forensic confirmation necessitates independent chromatographic analysis, not a second immunoassay.

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    Area of Science:

    • Forensic Toxicology
    • Analytical Chemistry
    • Immunoassay Development

    Background:

    • Hair testing for drugs of abuse requires specialized immunoassays due to unique analytes (parent drugs and lipophilic metabolites) and matrix effects.
    • Standard urine drug immunoassays are unsuitable for hair analysis because they lack specificity for hair-borne drug forms and are prone to interference.

    Purpose of the Study:

    • To outline the critical requirements for developing and validating immunoassays for hair drug testing.
    • To emphasize the importance of appropriate antibody selection, matrix interference mitigation, and optimized cutoffs for accurate hair drug screening.

    Main Methods:

    • Review of immunoassay principles and their application to hair matrix analysis.
    • Discussion of solid-phase immunoassays (e.g., coated-tube RIA, coated-plate ELISA) versus homogeneous assays for hair testing.
    • Emphasis on optimizing assay cutoffs based on drug concentrations in known user and non-user hair samples.

    Main Results:

    • Immunoassays for hair testing must exhibit cross-reactivity with hair analytes and minimize matrix interference.
    • Solid-phase immunoassays are preferred over homogeneous assays due to reduced hair matrix interference.
    • Optimized cutoffs are crucial for achieving >90% sensitivity and specificity, avoiding false positives near the limit of detection.

    Conclusions:

    • Immunoassays are valuable for rapid, cost-effective screening of hair for drugs of abuse.
    • Forensic confirmation requires a non-immunoassay method (e.g., chromatography) on a separate aliquot to ensure validity.
    • Future immunoassay development will continue to enhance automated drug screening procedures.

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