Gel and Clot Activator Tube also known as SST tube, which means serum separator tube. The cap of the Gel and Clot Activator Tube is orange, and there is coagulant in the blood collection tube to accelerate the coagulation process. It can clot the collected blood within 5 minutes, which is suitable for emergency serum series tests. It is the most commonly used coagulant tube for daily biochemistry, immunity, serum, hormone, etc. After blood drawing, it can be mixed upside down for 5-8 times. When the room temperature is low, it can be put in 37℃ water bath for 10-20 minutes, and centrifuge the upper serum for use.