Orange cap tubes with orange safety caps, which indicate that there is special clot activator from GEB in this blood collection tubes, can quickly provide complete serum with clinical laboratory, which is widely used in emergency biochemical and immunological tests. The special clot activator is evenly coated inside the whole tube for maximizing the contacting area with blood. It doesn't dissolve in serum and doesn't substance with blood cell, and has lower competitive absorption of protein, which increase the output and ensure the quality of serum in the greatest extent