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Interlaboratory variability of valproic acid determinations.

D Schmidt, B Ferrandes, D Grandjean

    Arzneimittel-Forschung
    |January 1, 1977
    PubMed
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    Interlaboratory variability in dipropylacetate analysis was high, with few labs meeting confidence limits. However, precision for repeated measurements was good, indicating reliable individual lab performance for this antiepileptic drug analysis.

    Area of Science:

    • Clinical Chemistry
    • Pharmacology
    • Analytical Chemistry

    Background:

    • Quantitative analysis of antiepileptic drugs is crucial for therapeutic drug monitoring.
    • Dipropylacetate (DPA) is a major antiepileptic drug requiring accurate measurement.
    • Interlaboratory variability can impact patient care and drug efficacy.

    Purpose of the Study:

    • To assess the interlaboratory variability and precision of quantitative dipropylacetate analysis.
    • To compare the performance of different analytical procedures for DPA quantification.

    Main Methods:

    • 19 pooled plasma specimens were analyzed as unknowns by 13 participating laboratories.
    • Data on interlaboratory variability and precision (coefficient of variation) were collected.
    • Results were compared against 95% confidence limits for each sample.

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    Main Results:

    • High interlaboratory variability was observed, with only 4 out of 13 labs meeting 6-12% confidence limits.
    • Precision of repeated determinations was good, with 6 out of 10 labs achieving <5% coefficient of variation.
    • Reproducibility and agreement between procedures were comparable to other major antiepileptic drugs.

    Conclusions:

    • Significant challenges exist in achieving consistent interlaboratory results for dipropylacetate quantification.
    • Individual laboratory precision for DPA analysis is generally good.
    • Standardization efforts may be needed to improve interlaboratory agreement for DPA measurements.