Erythrocyte suspension is the clinical term for de-leukocyte suspension of red blood cells, which is generally used when anemic patients require blood transfusion. It is prepared by collecting human blood in a triple bag, removing most of the plasma through centrifugation techniques, and then adding erythrocyte preservation fluid, which is clinically referred to as de-leukocyte suspension. Its main component is red blood cells, and its shelf life varies somewhat depending on the preservative solution added. Most of the clinically used ones can be stored at room temperature 2-6°C for 35 days. Because depleted red blood cells remove most of the plasma and white blood cells, it can reduce the side effects caused by plasma and white blood cells, such as transfusion reactions, some common infectious diseases, etc. At the same time, because the addition of the preservation solution not only preserves the red blood cells well, but also has a dilution effect to make the input process smoother, clinically patients with severe anemia generally need to be transfused with de-white suspended red blood cells.