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[Pseudothrombocytopenia--an error in the determination of thrombocyte count].

Automated counting resulted in erroneously low numbers of platelets (pseudothrombocytopenia) in three patients. The machine-derived values (ELT-8) were initially 30 000, 8000 and 8000/microliter, respectively. Numerous agglutinates could be demonstrated in the counting chamber. Whereas counting in the first patient showed a real value with an average of 252 000/microliter both the other preparations could not be counted due to numerous agglutinates. The artificially low number of platelets in the counter can thus be explained by lack of recognition as platelets due to the size of the in vitro formation of agglutinates. Should these be of the size of white cells leukocytosis may be suggested. Formation of agglutinates was not limited to use of EDTA as anticoagulant but could also be observed with other anticoagulants such as heparin and citrate. For prevention of superfluous and potentially dangerous therapeutic steps the diagnosis of platelet deficiency should be ascertained in any case by additional determination of the platelet count in the counting chamber.