Product Name: Sodium Citrate 4: 1 Tube, Cap Color: Black, Blood Depth: 1.28ml, Material: Glass, Plastic, Specification: 8 * 120 mm Blood sample collection for blood cell deposition rate in clinical medical tests. Concentration of citrate 0.129mol / L, the exact ratio of blood to anticoagulant is 4: 1. The tube is equipped with 0.129mol / L sodium citrate 0.32ml, blood 1.28ml, to the central scale, the total capacity of 1.6ml. Blood immediately after repeated 4-5 times, so that the anticoagulant fully mixed with the blood, and then into the D2010 automatic ESR, 30 minutes after the number of readings. The product saves time and effort, from the source to eliminate the cross infection.