Heparin is a natural anticoagulant found in a healthy organism.

Plasma is a component of blood free of blood cells by way of centrifugation. The clotting of plasma is prevented by adding an anticoagulant immediately after collection.

Lithium and sodium salts of heparin guarantee complete inactivation of blood coagulation and do not alter the parameters tested.

Specimen: heparinized plasma.
The interior of the tube wall is coated with dry heparin (12-30 IU of heparin per 1 ml of blood).
Centrifugation conditions: 1300 g for 10 minutes.