Platelet aggregation by ADP, collagen, thrombin and ristocetin was studied systematically both in citrate platelet rich plasma and isolated platelets by density gradient using albumine (according to Nicholls and Hampton) in various cases of congenital haemorrhagic diathesis, namely v. Willebrand disease, Glanzmann disease (thrombasthenia), Thrombopathy (PF3, defect), Factor XIII deficiency and in unclassified hereditary haemorrhagic disorders as well as in acquired bleeding tendency. According

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... o the platelet abnormalities found during this study a classification of "Thrombopathies" observed in Greece is attempted.