A nurse is giving a presentation about preventing deep-vein thrombosis (DVT). Which of the following should the nurse include as a risk factor for this disorder? (Select all that apply.)

Choice A reason: Immobility is a major risk factor for DVT. Prolonged bed rest, postoperative recovery, or paralysis can lead to venous stasis, increasing the likelihood of clot formation in the deep veins of the legs. Choice B reason: A BMI of 20 is within the normal range and does not increase the risk for DVT. Obesity (BMI ≥30) is a recognized risk factor due to increased venous pressure and inflammation. Choice C reason: Oral contraceptive use, especially those containing estrogen, increases the risk of thromboembolic events. Estrogen promotes coagulation and can lead to hypercoagulability, particularly in women with other risk factors. Choice D reason: Hypertension contributes to vascular damage and endothelial dysfunction, which can predispose individuals to clot formation. While not the strongest risk factor, it is relevant in the context of cardiovascular health. Choice E reason: High calcium intake is not associated with increased risk of DVT. Calcium plays a role in muscle contraction and bone health but does not directly influence coagulation pathways or venous stasis.