How is venous reflux detected during ultrasound?

Done by technician: Duplex ultrasonography (DUS) has evolved to become the primary diagnostic tool used to evaluate patients with superficial venous insufficiency. DUS is typically used to evaluate the great and small saphenous veins and their primary tributaries. These veins are found superficial to the deep fascia within the saphenous sheath. he examination should be performed in the appropriate standing position

Doppler: The scan can show the direction of blood flow and therefore it can tell front from backward flow.