How are platelets measured in blood?
A platelet count test measures the amount of platelets in the blood. A blood sample is taken from a vein on the inside of the elbow for the test. Because various conditions can affect the number of platelets in the blood, a platelet count test is used to indicate the presence of a disease or to determine whether there is excessive bleeding. A platelet aggregation test measures the ability of platelets to form clots. This test is usually given to determine whether in inability to clot is due to bleeding issues (like hemophiliacs) or if it is the result of an acquired condition.
