Final answer:
Heparin is delivered for DVT prophylaxis by subcutaneous injection, often into the abdomen, to prevent blood clot formation in patients at risk.
Step-by-step explanation:
A nurse correctly delivers heparin for deep vein thrombosis (DVT) prophylaxis by administering it via subcutaneous injection. The injection is typically given in areas of the body with a layer of fat under the skin, such as the abdomen. Heparin is an anticoagulant that helps to prevent the formation of blood clots, which can occur in the deep veins of the legs, known as DVT. Patients at risk for DVT, such as those with heart failure or immobility, may be given heparin to minimize the risk of clot formation, especially in situations that increase the risk like long periods of sitting or air travel.