Diagnostics of thrombocytopenias


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Abstract

Laboratory methods used for the diagnostics of thrombocytopenias are reviewed. Differential diagnosis is usually carried out between immune and hypoproductive forms of thrombocytopenia. Immune thrombocytopenias are caused by appearance in blood of antiplatelet abtibodies and accelerated destruction of platelets sensibilized by those antibodies, and hypoproductive thrombocytopenias - by impaired platelet production in the bone marrow. Main directions of the laboratory diagnostics of thrombocytopenias - analysis of auto - and alloautoantibodies and evaluation of platelet production and turnover in the blood stream. The following methods are used for the investigation of antiplatelet antibodies: 1) measurement of platelet associated immunoglobulins; 2) determination of circulating antibodies reacting with platelets; 3) determination of antibodies using antigen specific methods - by their reactivity with isolated platelet antigens (glycoproteins). Efficacy of platelet production could be assessed by measuring in blood the amount of “young” (reticulated) platelets. One more method for the evaluation of platelet production as well as the rate of platelet turnover - measurement of plasma soluble glycocalicin, glycoprotein Ib fragment shed from the surface of platelets upon their destruction in spleen and liver. In patients with immune thrombocytopenia autoantibodies are evaluated in all cases, the percentage of reticulated platelets is significantly increased and the amount of plasma glycocalicin is within the normal range or increased. In patients with hypoproductive thrombocytopenia autoantibodies are not detected or detected at low level, the percentage of reticulated platelets is within the normal range or slightly increased and the amount of plasma glycocalicin is lowered. Diagnostics of hapten forms of immune thromocytopenias (heparin-induced thrombocytopenia and others) and of alloimmune thrombocytopenias (neonatal alloimmune thrombocytopenia in particular) are considered in the separate sections of this review.

About the authors

A V Mazurov

National Medical Research Center for Cardiology Russian Ministry of Health

Email: avmazurov@list.ru
д.м.н., проф., руководитель лаборатории Moscow, Russia

S G Khaspekova

National Medical Research Center for Cardiology Russian Ministry of Health

к.б.н., с.н.с. Moscow, Russia

S A Vasiliev

National Medical Research Center for Hematology Russian Ministry of Health

д.м.н., проф., врач-гематолог Moscow, Russia

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