Interpretability of the Quantra® Viscoelastic Test in Patients With Haematological Malignancies With Profound Thrombocytopenia Below 50x10 G/L.

A blood sample will be taken from all patients included in the study. This blood sampling is an added act of the study. It will be performed as soon as possible after inclusion in the study. The total volume of blood drawn will be 12.1 mL. The following analyses will be performed: Quantra®, Rotem®, blood count, platelets, immature platelet count, plasma prothrombin time, activated partial thromboplastin time, International Normalized Ratio, fibrinogen.