RESUMO
Pseudothrombocytopenia is usually associated with blood specimens anticoagulated with ethylenediamine tetraacetic acid (EDTA) or other anticoagulants. It may be caused by temperature-independent, EDTA-dependent antibodies of the immunoglobulin-M (IgM) type. Here a patient with EDTA-independent and temperature-independent pseudothrombocytopenia mediated by IgM or IgM-containing immune complex is reported, and a reliable method is described for a proper counting of platelets in such cases.
Assuntos
Contagem de Plaquetas/métodos , Trombocitopenia/sangue , Especificidade de Anticorpos/imunologia , Plaquetas/imunologia , Plaquetas/metabolismo , Ácido Edético , Humanos , Imunoglobulina M/imunologia , Masculino , Pessoa de Meia-Idade , Temperatura , Trombocitopenia/patologiaRESUMO
A simple and sensitive flow cytometric method is presented for the quantitation of erythrocyte subpopulations. Cells were indirectly labelled using human antisera (mostly crude) and fluorescein isothiocyanate (FITC)-conjugated anti-human IgG Fab. The method was evaluated by analysing artificial mixtures of blood group antigens A, B, D, E, c, K and Fy(a). Intra-assay coefficients of variation were found to be 7.2% for 1% D-positive mixtures and 2.2% for 10% D-positive mixtures: the inter-assay coefficients of variation were 9.5% and 6.0% respectively. The sensitivity of the method was found to be 0.31%. The method has shown to be suitable for the routine follow-up of patients after allogeneic bone marrow transplantation (BMT).
