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.