Which position is best for performing venous reflux testing?

• A. Standing
• B. Supine
• C. Prone
• D. Sitting

Answer: (A)

The key idea is that venous reflux testing relies on provoking the venous system to reveal abnormal backflow. Standing creates the greatest hydrostatic pressure in the leg veins, causing them to distend. If the valves are incompetent, this upright stance makes reflux more likely to occur and be detected on duplex examination. In a supine or prone position, venous pressures are lower and the veins aren’t as distended, so reflux can be less apparent or missed even when valve failure exists. Sitting offers some gravity but doesn’t produce as consistent a provocative effect as standing. For that reason, standing is the best position to perform venous reflux testing.