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Related Experiment Videos

Immunoplatelet counting: a proposed new reference procedure.

P Harrison1, A Horton, D Grant

  • 1Haemostasis Research, Department of Haematology, 98 Chenies Mews, University College London WC1E 6HX, UK.

British Journal of Haematology
|February 26, 2000
PubMed
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A new immunoplatelet counting method offers a precise and reliable alternative to manual platelet counts. This rapid method, using the red blood cell (RBC) ratio, achieves high accuracy, especially in low platelet count samples.

Area of Science:

  • Hematology
  • Clinical Pathology
  • Immunology

Background:

  • Manual platelet counting suffers from significant interoperator variability and imprecision.
  • Immunoplatelet counting using monoclonal antibodies is proposed as a superior reference method.
  • Accurate platelet quantification is crucial for diagnosing and managing various hematological conditions.

Purpose of the Study:

  • To establish a rapid and simple immunoplatelet counting method.
  • To compare the accuracy and precision of this new method against existing reference techniques.
  • To evaluate the utility of the red blood cell (RBC) ratio for platelet quantification.

Main Methods:

  • Immunophenotyping of platelets using fluorescently labeled monoclonal antibodies.
  • Simultaneous counting of platelets and red blood cells (RBCs) via flow cytometry.

Related Experiment Videos

  • Derivation of platelet count from the ratio of platelet events to RBC events (RBC ratio).
  • Comparison with manual phase contrast microscopy and automated hematology analyzers (impedance and optical counters).

    • Main Results:

    • The RBC ratio method demonstrated a coefficient of variation < 5%, even for platelet counts below 20 x 10(9)/l.
    • Excellent correlation was observed between the RBC ratio and manual counts (r2 = 0.93).
    • High correlation was found with automated counters (r2 = 0.98-0.99), with superior performance for optical counters in thrombocytopenic samples (r2 = 0.96).

    Conclusions:

    • The proposed immunoplatelet counting method using the RBC ratio is rapid, cost-effective, and precise.
    • This method shows potential to replace manual platelet counts as a new international reference procedure.
    • Automated optical counters may offer enhanced accuracy for platelet counts in patients with low platelet levels.