Pro-coagulation tube, also known as a clot activator tube or serum separator tube. The cap of the pro-coagulation tube is yellow, and coagulant is added to the blood collection tube. The coagulant can quickly activate the coagulation mechanism and accelerate the coagulation process. The type of specimen prepared is serum, which is suitable for biochemical and pharmacokinetic tests of emergency serum. After collection, the samples were mixed upside down for 5-8 times, stood upright for 20-30min, and centrifuged supernatant for use. The specimen remained stable for 48 hours after centrifugation.