Duplex Venous Ultrasound
Duplex venous ultrasound (also known as a venous reflux exam) is a non-invasive imaging tool that can be used to assess vein function. It locates and evaluates if your blood is flowing in the wrong direction (also called venous reflux) and ensures that there are no other vein-related conditions such as blood clots or blockages. The results of a duplex venous ultrasound helps your physician plan a path forward in treating the underlying causes of your venous insufficiency (also referred to as varicose veins).
In a healthy leg, the veins push the blood upward in route to your heart. In individuals with venous insufficiency, quantities of blood can pool in the veins and cause a wide variety of medical symptoms including the presentation of varicose veins. Ultrasounds are more affordable and quicker to perform than other types of imaging scans like CT scans or MRIs however the outcome of the results rely heavily on the skills of the operator. Sometimes you may not want to trust the results of your ultrasound. For more detailed information on ultrasounds and what you need to know to make an informed decision, make sure to read the section below.
What to Expect During a Venous Reflux Exam
Duplex venous ultrasounds can be performed by a technician without the need for anesthesia. A handheld ultrasound “wand” is run over the length of the legs sending sound waves in to the leg. Those sound waves are reflected back (like a sonar or fish finder). The data is processed and used to create a series of images. These images allow the physician to examine any abnormalities in the veins and valves. It also shows the flow rate and direction of the blood in the veins.
These painless tests typically start with laying on a table. After applying a conductive gel, the vascular technologist will pass the wand over the area to be tested. Once the supine (lying down) assessment of your veins is performed, you will be asked to stand up to evaluate reflux. This is an essential step since gravity plays a significant role in venous insufficiency. The next part of the exam is crucial. The ultrasound tech squeezes and then releases your calf to see how this affects blood flow. The tech can use his or her hand or an automatic clamp. If you are suffering from venous insufficiency, this procedure will provoke the blood in your leg to travel back towards your foot. This can easily be detected by ultrasound. A duplex venous ultrasound exam generally takes between 30 minutes to an hour depending on if both legs are being evaluated or not.
Duplex venous ultrasounds are typically conducted as part of an overall varicose vein evaluation. Venous reflux examinations are non-invasive tests that don’t require a recovery period and are completely painless. No downtime or aftercare are required before returning to your normal daily activities. As no anesthesia is required, you can drive yourself home after the appointment is you normally drive yourself. I can be difficult to remove the ultrasound gel without a shower.