What color is the tube that blood drawn in for troponin levels?

The tube that blood is drawn in for troponin levels is typically red or red-top tube. This type of tube contains clot activator, which speeds the clotting process of blood. Once the blood has clotted, the serum is separated from the clot and can be tested for various analytes, including troponin. Troponin is a protein that is found in the heart muscle, and its levels in the blood can be indicative of heart damage or injury.