MedGen

Platelet-type bleeding disorder-17 is an autosomal dominant disorder characterized by increased bleeding tendency due to abnormal platelet function. It is a type of 'gray platelet syndrome' because the platelets appear abnormal on light microscopy. Electron microscopy shows decreased or absent alpha-granules within platelets, and bone marrow biopsy shows increased numbers of abnormal megakaryocytes, suggesting a defect in megakaryopoiesis and platelet production. The bleeding severity is variable (summary by Monteferrario et al., 2014). [from OMIM]

The prothrombin consumption test measures the formation of intrinsic thromboplastin by determining the residual serum prothrombin after blood clotting is complete. If there is a defect in the process, less prothrombin will be converted to thrombin than normal (less prothrombin is consumed). This test may be abnormal with conditions including deficiency of factors VIII or IX, with circulating anticoagulants, thrombocytopenia. [from HPO]