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Platelet counts in capillary blood.

J H Feusner, J A Behrens, J C Detter

    American Journal of Clinical Pathology
    |September 1, 1979
    PubMed
    Summary
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    Capillary blood platelet counts are often lower than venous blood counts, potentially leading to misdiagnosis of thrombocytopenia. For precise platelet counts, venous blood samples are recommended.

    Area of Science:

    • Hematology
    • Clinical Pathology

    Background:

    • Accurate platelet counts are crucial for diagnosing and managing various bleeding disorders.
    • Automated particle counters are widely used for blood cell analysis, including platelet enumeration.

    Purpose of the Study:

    • To evaluate the accuracy of platelet counts obtained from capillary blood compared to venous blood using an automated particle counter.
    • To determine the clinical significance of discrepancies in platelet counts between capillary and venous blood samples.

    Main Methods:

    • Simultaneous collection of venous and capillary blood samples from healthy adults and thrombocytopenic patients.
    • Platelet counts were determined using an automated particle counter for both sample types.
    • Statistical analysis was performed to compare mean platelet counts and assess the significance of differences.

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    Main Results:

    • A statistically significant difference (P < .001) was observed between mean venous (248,300/microliter) and capillary (215,500/microliter) blood platelet counts in healthy adults.
    • Capillary blood underestimated venous counts by ≥25% in 24% of subjects, with three erroneously classified as thrombocytopenic.
    • Similar significant differences (P = 0.01) were found in thrombocytopenic patients (venous: 72,500/microliter; capillary: 65,400/microliter).

    Conclusions:

    • While capillary blood platelet counts may suffice for general patient evaluation, they exhibit significant underestimation compared to venous counts.
    • Venous blood samples are essential when accurate platelet quantification is critical for clinical decision-making.
    • The findings highlight the potential for diagnostic errors when relying solely on capillary blood for platelet counts, particularly in borderline or low ranges.