Why calcium supplementation after blood transfusion, depending on the patient’s specific situation, such as anemia patients, when correcting anemia, a small number of transfusions of red blood cells blood, its large number of post-transfusion calcium supplementation is to enhance the calcium ions in the blood, to prevent citric acidosis. That blood bag supplied by the blood station is to save the blood, and in order to prevent the blood from coagulating when blood is collected, in the blood bag, sodium citrate anticoagulant is added, and the citrate root ions in sodium citrate can combine with the calcium ions in the blood to form a soluble complex, which reduces the calcium ions in the blood, and thus causes the post-transfusion hypocalcemia, so when every 600ml of blood is inputted, the patient should be given 3ml of 10% calcium chloride, or Therefore, for every 600 ml of blood, the patient should be given 3 ml of 10% calcium chloride or 10 ml of 10% calcium gluconate, so it depends on the patient’s bleeding condition and vital signs.