What is the usual dose of heparin for measuring central venous pressure

10 to 20 mg. The usual dose of heparin is 10 to 20 mg per 1000 ml of saline, i.e., 10 to 20 U per milliliter. Central venous pressure (CVP) is the pressure at the junction of the superior vena cava or inferior vena cava and the right atrium, and is an important indicator of right heart function and venous return. Heparin saline is often used when measuring central venous pressure to prevent blood clotting.