A platelet blood count is a blood test that measures the average number of platelets in the blood. Platelets help the blood heal wounds and prevent excessive bleeding. High or low platelet levels can be a sign of a severe condition.
Vitamin B12 is a nutrient that helps keep the body’s nerve and blood cells healthy and helps make DNA, the genetic material in all cells. Vitamin B12 also helps prevent a type of anemia called megaloblastic anemia that makes people tired and weak.