The orange safety cap indicates that this blood collection tube contains the ORSIN-specific clot activator. This formulation is designed to rapidly provide clinically clear serum for laboratory testing, making it widely applicable for emergency biochemistry and immunology assays.

The ORSIN-specific clot activator is uniformly coated on the entire inner surface of the tube. This maximizes the contact area with the blood sample. The activator itself is insoluble in serum and does not undergo substance exchange with blood cells. Furthermore, it exhibits minimal competitive adsorption towards proteins.

These properties maximize serum yield and ensure high serum quality for downstream testing.