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Related Experiment Videos

Prothrombin time derived fibrinogen determination on Sysmex CA-6000

A S Lawrie1, S J McDonald, G Purdy

  • 1Department of Haematology, University College London, UK. andrew.lawrie@ucl.ac.uk

Journal of Clinical Pathology
|October 15, 1998
PubMed
Summary

Prothrombin time (PT) derived fibrinogen is unreliable for patient monitoring due to inconsistent results across different clinical groups and reagents. While not suitable for routine use, it may serve as a screening tool in research settings for specific patient populations.

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Area of Science:

  • Clinical Chemistry
  • Hematology
  • Diagnostic Assays

Background:

  • Fibrinogen levels are critical for hemostasis.
  • The Clauss assay is the gold standard for fibrinogen measurement.
  • Prothrombin time (PT) derived fibrinogen offers a potential alternative, but its reliability needs evaluation.

Purpose of the Study:

  • To compare PT-derived fibrinogen with the Clauss assay.
  • To assess the performance of PT-derived fibrinogen across diverse patient groups.
  • To determine the suitability of PT-derived fibrinogen for clinical monitoring.

Main Methods:

  • Analyzed samples from various patient cohorts (normal, renal/liver dysfunction, critically ill, on anticoagulants, haemoglobinopathy).
  • Performed PT using rabbit brain and recombinant human tissue factor thromboplastins.

Related Experiment Videos

  • Measured fibrinogen using the Clauss method on a Sysmex CA-6000 analyzer.

    • Main Results:

    • PT-derived fibrinogen showed significant differences (p < 0.001) compared to Clauss fibrinogen.
    • The correlation varied based on patient clinical group and thromboplastin source.
    • Pooled data confirmed significant discrepancies irrespective of the thromboplastin used.

    Conclusions:

    • PT-derived fibrinogen is unsafe for routine patient monitoring due to variable accuracy.
    • Its utility is limited to research settings for estimating fibrinogen in specific patient groups.
    • The choice of thromboplastin and patient's clinical status significantly impact PT-derived fibrinogen results.