The tube is for special use in blood collection and anti-coagulation in ESR. Anti-coagulant type and density: sodium citrate 0.109mol/L. Anti-coagulant status: liquid Color: yellow Normal tube specification: 13x75 Designed collection volume: 1.6ml, 2.4ml Size ratio of anti-coagulant and blood sample: 1:4 Vaccum deviation: less than 5% Applicble altitude tolerence: 200m Applicable altitude: see the package Vertical static pressure: 16kg/cm2 Note: 1. When used in primary collection, it should be changed when the current stops; when used in secondary collection, it should be changed when the line breaks. 2. It is not allowed to use after the stopper is removed for 24 hrs.