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Related Experiment Videos

Measuring partial thromboplastin-time. An international collaborative study.

L Poller, J M Thomson

    Lancet (London, England)
    |October 16, 1976
    PubMed
    Summary
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    A standardized partial thromboplastin-time (PTT) test demonstrated superior accuracy in detecting clotting abnormalities compared to local methods. This improved diagnostic precision in PTT testing was observed across numerous international hospitals.

    Area of Science:

    • Clinical Chemistry
    • Hematology
    • Diagnostic Accuracy

    Background:

    • The partial thromboplastin-time (PTT) test is crucial for assessing intrinsic coagulation pathways.
    • Variability in PTT reagents and techniques can lead to diagnostic inaccuracies.
    • Standardization efforts are essential to improve the reliability of laboratory testing.

    Purpose of the Study:

    • To evaluate the efficacy of a standardized PTT reagent and technique.
    • To compare the performance of the standardized method against routine local PTT methods.
    • To assess the accuracy in detecting various intrinsic clotting abnormalities.

    Main Methods:

    • Collaborative exercise involving over 300 hospital centers globally in 1975.
    • Distribution of standardized lyophilized test plasmas, PTT reagent, and technique by WHO.

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  • Parallel testing of samples using standardized and local PTT reagents/methods.

    • Main Results:

    • The standardized PTT method showed a higher success rate in detecting intrinsic clotting abnormalities.
    • Fewer false positive results were reported with the standardized method for normal plasma.
    • A weighted index confirmed the superiority of the standardized method over other reagents.

    Conclusions:

    • The standardized PTT reagent and technique proved superior to routine methods in detecting clotting defects.
    • Failures in commercial reagents may stem from insensitivity or unreliable techniques.
    • The standardized method offers improved diagnostic accuracy for PTT testing.