Which test is commonly used to evaluate venous reflux when the patient can tolerate standing?

• A. Standing venous reflux test
• B. Supine reflux test
• C. Prone reflux test
• D. Seated reflux test

Answer: (A)

Reflux is best demonstrated when the venous system is under the highest hydrostatic load, which occurs with standing. In a standing position, gravity increases venous pressure in the legs, so incompetent valves let backward flow become evident on duplex evaluation. This makes reflux more detectable and quantifiable, especially when you use provocative maneuvers to elicit it.

In a supine position, venous pressure is lower and veins are less distended, which can mask reflux and make it harder to confirm valvular incompetence. Prone or seated positions don’t reproduce the gravity-dependent conditions that reveal reflux as reliably. Therefore, when the patient can tolerate standing, the standing venous reflux assessment is the preferred approach to evaluate venous insufficiency.