An examination of the veins is completely painless. With a special vascular ultrasound (color duplex), the condition of the veins and venous valves, as well as the blood flow, can be assessed very accurately. In dilated veins, the venous valves are leaking and there is a harmful reflux, leading to high pressure in the veins. This causes the occurrence of varicose veins, spider veins, swelling, eczema and indurations on the lower legs. After the diagnosis has been made, patients are advised on the treatment options.