Observational Registry of the Treatment of Glanzmann's Thrombasthenia

Inclusion Criteria: * Patients with congenital GT defined as patients with lifelong bleeding tendency characterised by impaired or absent platelet aggregation, impaired clot retraction and prolonged bleeding time or prolonged platelet function analyser closure time. The patient has normal platelet counts and platelet morphology. Optional diagnosis criteria are quantitative or qualitative evaluation of GP (Glycoprotein) IIb/IIIa receptor including flow cytometry and identification of gene defects * Signed informed consent by the patient or next of kin or legally acceptable representative to collect data on treatment of a given bleeding episode or surgical event as specified in the protocol. If informed consent is provided by the next of kin or legally acceptable representative, consent must also be obtained from the patient as soon as he/she is able to do so. Informed consent must be obtained before entry of data into the registry Exclusion Criteria: * Patients with acquired thrombasthenic states caused by autoimmune disorders (acute or chronic) or drugs