Platelet density in essential thrombocythemia and polycythemia vera

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Abstract
This study aims to compare platelet density in myeloproliferative disorders (essential thrombocythemia (ET) and polycythemia vera (PV)) with platelet density of healthy subjects. Platelet density peaks were determined using a specially designed apparatus for scanning light transmission variations along test tubes containing density-separated platelets. Eighteen patients with myeloproliferative disorders (nine ET and nine PV) were compared with a control group consisting of 12 healthy volunteers. Compared with healthy volunteers, patients with myeloproliferative disorders had significantly lower platelet peak density ( P< 0.001). It is concluded that determination of peak platelet density may be a useful tool for excluding ET and PV. A high platelet density peak makes a clonal disorder less likely and a low density peak would confirm the suspicion.

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