A nurse is providing education to a client about the risk factors for deep vein thrombosis (DVT). Which statement made by the client indicates a need for further teaching?

A) This choice is correct. Encouraging active range of motion exercises helps prevent deep vein thrombosis (DVT) by promoting blood flow and reducing stasis in the veins. Moving the legs and ankles regularly helps prevent clot formation in immobilized clients.

B) This choice is incorrect because low-dose aspirin is not specifically indicated for preventing DVT. While aspirin may have some antiplatelet effects, it is not the primary preventive measure for DVT in high-risk clients.

C) This choice is incorrect because applying a heating pad to the affected leg is not a preventive measure for DVT. Heat application is not recommended for DVT prevention and could cause burns or injury.

D) This choice is incorrect because providing a soft mattress for the client's bed does not directly prevent DVT. The focus should be on encouraging movement and mobility to prevent DVT in clients at risk.

A) This choice is incorrect because the D-dimer blood test is a screening test for DVT but does not directly assess blood flow or detect clots non-invasively.

B) This choice is incorrect because magnetic resonance imaging (MRI) is a sensitive imaging modality, but it may not be readily available or suitable for all clients. It is not the primary choice for non-invasive assessment of blood flow and clots in suspected DVT.

C) This choice is incorrect because contrast venography is an invasive procedure involving the injection of contrast dye and X-ray imaging. It is not non-invasive, and venous Doppler ultrasound is a preferred first-line test.

D) This choice is correct. Venous Doppler ultrasound is a non-invasive imaging test used to assess blood flow in the veins and detect clots in the deep veins of the legs. It is readily available, safe, and does not involve the use of contrast dye or radiation.