lood is made up of several types of cells. These cells float in a liquid called plasma. The types of blood cells are:red blood cellswhite blood cellsplatelets, or thrombocytesWhen your skin is injured or broken, platelets clump together and form clots to stop the bleeding. When you don’t have enough platelets in your blood, your body cannot form clots.A low platelet count may also be called thrombocytopenia. This condition can range from mild to severe, depending on its underlying cause. For some, the symptoms can include severe bleeding and are possibly fatal if they’re not treated. Other people may not experience any symptoms.Typically, a low platelet count is the result of a medical condition, like leukemia, or certain drugs. The treatment usually addresses the condition causing the thrombocytopenia.