S-Monovette® Citrate 3.2%, preparation: Trisodium citrate solution, color code – green, Tube material – Polypropylene (PP), sterile. Usage (plasma) – Partial thrombin time (PTT), Prothrombin Time (PT), Thrombin Time (TT), Fibrinogen (Fib), coagulation factors, and Coagulation inhibitors.