[Pseudothrombocytopenia].

Pseudothrombocytopenia in four patients has been described. It was due to platelet "++EDTA-dependent" antibodies. The number of platelets was described only in EDTA blood while the number was normal when platelet were evaluated in citrate blood. The importance of distinguishing pseudothrombocytopenia from thrombocytopenia is discussed, especially in view of unnecessary treatment, delayed operation etc.