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Pseudothrombocytopenia with cold-type platelet agglutinins
Japanese Journal of Medicine
|January 1, 1983
Summary
Pseudothrombocytopenia is an in vitro platelet clumping issue caused by EDTA, leading to inaccurate automated platelet counts. This phenomenon involves immunoglobulin agglutinins reacting with platelet antigens, especially at colder temperatures.
Area of Science:
- Hematology
- Immunology
- Clinical Pathology
Background:
- Pseudothrombocytopenia is an artifactual reduction in platelet count.
- It arises from in vitro platelet agglutination during automated blood analysis.
Observation:
- Platelet clumping is pronounced in ethylenediaminetetraacetic acid (EDTA) anticoagulated samples.
- Agglutination is minimal with other anticoagulants like heparin.
- The phenomenon is temperature-dependent, occurring more readily at cold temperatures compared to 37°C.
Findings:
- Immunofluorescence reveals agglutinins are immunoglobulins (heavy and light chains), potentially with complement.
- These agglutinins target platelet-specific antigens.
- The EDTA-dependent agglutination mechanism explains pseudothrombocytopenia.
Implications:
- Accurate platelet counts are crucial for diagnosing and managing bleeding disorders.
- Understanding pseudothrombocytopenia prevents misdiagnosis of thrombocytopenia.
- Alternative anticoagulants or pre-warming samples can ensure accurate platelet counts.