Why do you need to draw a red pipe and a yellow pipe for health certificate?

The red test tube is used to detect blood biochemistry, and the yellow test tube is used to detect serum biochemistry, syphilis, AIDS, hepatitis B and thyroid function. The reason why the health certificate needs to draw a red tube and a yellow tube is to check the body. The order of blood collection is usually selected according to the color of the test tube and the examination required for different diseases, that is, the red test tube: there is usually no anticoagulant, which is used to test blood biochemistry and liver and kidney function. Yellow test tube: containing separation gel, used to detect serum biochemistry, syphilis, AIDS, hepatitis B, thyroid function, etc. Blue tube: it is a kind of blood coagulation test tube, which is mainly used to detect coagulation function, prothrombin time, fibrin and platelet function. Black test tube: The test tube contains 3.8% citric acid, which is usually used to measure ESR. Green tube: heparin can play an anticoagulant role in blood collection and is used for erythrocyte fragility test and hemorheology test. Purple tube: used for counting and classifying routine blood cells, such as blood routine, blood ammonia, glycosylated hemoglobin, etc.