Serum blood collection tubes promise to provide unpolluted and undifferentiated original blood samples for medical testing.After centrifugation, serum can be effectively separated from blood cells and fibrin.There are three types of serum tubes: plain tube with red cap, a red cap precoagulation tube, and a yellow cap coagulation gel activator tube.
1. Plain tube with red cap
2. Pro-coagulation tube with red cap
3. Gel&clot activator tube with yellow cap.