Platelets are produced in the bone marrow, the same as the red cells and most of the white blood cells. Platelets are produced from very large bone marrow cells called megakaryocytes. read more
Please note, platelets are not measured in percentage form, but according to the number of platelets present per microliter of blood. The normal range falls between 1.5 million to 4.5 million platelets per microliter of blood. read more
On a stained blood smear, platelets appear as dark purple spots, about 20% the diameter of red blood cells. The smear is used to examine platelets for size, shape, qualitative number, and clumping. The ratio of platelets to red blood cells in a healthy adult ranges from 1:10 to 1:20. read more