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Microscopic platelet size and morphology in various hematologic disorders.

Z Zeigler, S Murphy, F H Gardner

    Blood
    |March 1, 1978
    PubMed
    Summary

    Platelet size and morphology analysis aids in diagnosing blood disorders. Optimal differentiation occurs with blood smears prepared 60 minutes post-venipuncture using K3EDTA anticoagulant.

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    Area of Science:

    • Hematology
    • Diagnostic Pathology
    • Blood Cell Morphology

    Background:

    • Microscopic examination of platelets is crucial for diagnosing various hematologic conditions.
    • Platelet size and morphology can be affected by preparation methods and time.
    • Understanding these variations is key to accurate diagnostic interpretation.

    Purpose of the Study:

    • To evaluate the diagnostic utility of platelet size and morphology in different hematologic disorders.
    • To determine the optimal time for blood smear preparation to differentiate patient categories.
    • To correlate platelet characteristics with specific hematologic conditions and platelet counts.

    Main Methods:

    • Microscopic evaluation of platelet size and morphology.
    • Comparison of blood smears prepared at different time points (immediately, 60 min, 180 min) post-venipuncture.
    • Use of K3EDTA as an anticoagulant for blood samples.
    • Analysis of platelet characteristics in normal individuals and patients with various hematologic disorders.

    Main Results:

    • Artifactual increase in platelet size observed in smears prepared immediately or 180 min post-venipuncture.
    • Optimal differentiation achieved with smears prepared 60 min post-venipuncture.
    • Normal size/morphology in thrombocytopenic aplasia or splenic pooling.
    • Large size in idiopathic thrombocytopenic purpura (ITP) with platelet counts <50,000/µL.
    • Large size and abnormal morphology ( >10% hypogranular platelets) in infiltrated bone marrow or myeloproliferative syndromes.
    • Normal size/morphology in iron-deficiency anemia, megaloblastic anemia, ITP, and systemic lupus erythematosus with normal platelet counts.

    Conclusions:

    • Blood smear preparation time significantly impacts apparent platelet size.
    • A 60-minute preparation time with K3EDTA provides reliable differentiation of patient categories.
    • Specific platelet size and morphology patterns are associated with distinct hematologic disorders.

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