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Related Experiment Videos

Comparison of several activated partial thromboplastin time methods.

R J Morin, D Willoughby

    American Journal of Clinical Pathology
    |August 1, 1975
    PubMed
    Summary

    Electrical conductivity clot timers yield lower activated partial thromboplastin times (APTTs) in certain patient plasmas compared to optical methods. This difference was most notable in factor II and V deficient plasmas and with added heparin.

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    Area of Science:

    • Clinical Chemistry
    • Hematology
    • Diagnostic Instrumentation

    Background:

    • Activated partial thromboplastin time (APTT) is a crucial coagulation test.
    • Different clot detection methods (electrical conductivity vs. optical) may influence APTT results.
    • Variations in APTT can impact clinical interpretation, especially in specific patient populations.

    Purpose of the Study:

    • To compare APTT results obtained using a semi-automated electrical-conductivity clot timer versus manual and automated optical methods.
    • To evaluate the influence of patient conditions (hepatic disease, intravascular coagulation, warfarin/heparin therapy) and specific factor deficiencies on APTT measurements.
    • To assess the impact of different activator-phospholipid reagents and in vitro heparin addition on APTT outcomes.

    Main Methods:

    • APTT was performed on patient plasmas (hepatic disease, intravascular coagulation, warfarin/heparin therapy) and normal plasmas using three methods: semi-automated electrical-conductivity, manual optical, and automated optical.
    • Experiments included substituting different activator-phospholipid reagents.
    • Prepared plasmas with varying levels of specific coagulation factors (II, V, VIII, IX, X) and in vitro heparin were also tested.

    Main Results:

    • Electrical-conductivity method yielded significantly lower APTTs for plasmas from patients with hepatic disease, intravascular coagulation, and those on warfarin or heparin therapy compared to optical methods.
    • No significant differences in APTT were observed among the three methods for normal plasmas.
    • Shorter APTT times were observed with the electrical-conductivity timer in factor II- and V-deficient plasmas and in plasmas with added heparin.

    Conclusions:

    • The semi-automated electrical-conductivity clot timer demonstrates a bias towards shorter APTT results in specific clinical scenarios and with certain plasma compositions.
    • These findings highlight potential differences in APTT measurements based on the detection principle, necessitating careful consideration in clinical practice.
    • Further investigation into the clinical implications of these method-dependent variations in APTT is warranted.

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