Detection of hepatitis B and half is not with the patient’s whole blood, but with the patient’s serum or plasma, so the blood collection can use red without any anticoagulant or procoagulant vacuum blood collection tube, can also use yellow separation gel procoagulant tube, but also with a variety of anticoagulant anticoagulant tube. Generally, according to the different uses of blood collection tubes and the different additives in the tubes, the blood collection tubes can be divided into seven different colors, namely red, yellow, green, blue, gray, black, purple. The general red tube does not add any anticoagulant and procoagulant vacuum blood collection tube, used to separate the serum. The yellow tube is the separation tube, the purple tube is mainly used for whole blood examination, the green tube is mainly used for heparin anticoagulation tube, and the blue tube is mainly used for coagulation project examination, etc.