Sodium Heparin is coated to inhibit clotting. Heparin activates anti thrombins, thus blocking the coagulation cascade, produce a plasma sample. Gently invert the tubes 180° 5-8 times immediately after blood collection or mix using roller mixer. Used for emergency Biochemistry test, but also for Endocrine and metabolic disorders, Therapeutic Drug monitoring and Toxicology, Electrolytes, Clinical chemistry, Serology and immunology etc. Centrifuge at 2000-3000 rpm for 10 min. at room temperature.