However, if the number of platelets is too high, blood clots can form (thrombosis), which may obstruct blood vessels and result in such events as a stroke, myocardial infarction, pulmonary embolism or the blockage
of blood vessels to other parts
of the body, such as the extremities
of the arms or legs.
Thrombocytopenia (a low platelet count) is defined as a platelet count < 150,000 cells/µL.
'Moderate thrombocytopenia' is a platelet count of 50,000-75,000 cells/µL.