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Homogeneous nonisotopic assay for phenytoin evaluated

S Dugan, J Bailey, J W Wu

    Clinical Chemistry
    |May 1, 1982
    PubMed
    Summary

    A new homogeneous immunoprecipitation assay accurately measures phenytoin levels in human serum without pretreatment. This spectrophotometry-based method offers a reliable alternative for therapeutic drug monitoring.

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    Area of Science:

    • Clinical Chemistry
    • Analytical Chemistry
    • Immunochemistry

    Background:

    • Phenytoin is an anticonvulsant medication requiring therapeutic drug monitoring.
    • Accurate and efficient assays are crucial for optimizing phenytoin dosage and patient outcomes.
    • Existing methods may require sample pretreatment or dilution, adding complexity.

    Purpose of the Study:

    • To evaluate a novel homogeneous immunoprecipitation assay for quantifying phenytoin in human serum.
    • To assess the assay's performance characteristics, including accuracy, precision, and comparison to existing methods.

    Main Methods:

    • Development of a homogeneous immunoprecipitation assay utilizing spectrophotometry.
    • The assay measures the inhibition of a precipitation reaction by free phenytoin.

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  • Automated analysis performed using a centrifugal analyzer with a 3-minute reaction monitoring time.

    • Main Results:

    • The assay requires no sample dilution or pretreatment.
    • Excellent precision was demonstrated with within-run and between-run coefficients of variation below 7%.
    • Results correlated well with a standard enzyme immunoassay (y = 1.10x + 1.1, r = 0.966).

    Conclusions:

    • The novel homogeneous immunoprecipitation assay provides a rapid, accurate, and precise method for phenytoin determination in human serum.
    • This assay simplifies the analytical process by eliminating the need for sample preparation.
    • It represents a valuable tool for therapeutic drug monitoring of phenytoin.