Vein Duplex Ultrasound: What to Expect, Why It's Done Standing, and What It Reveals

When a patient comes to me complaining of leg heaviness, swelling, or visible varicose veins, the first thing I do is perform a duplex vein duplex ultrasound right during the consultation. This is not a formality or an «add-on service» — it is the foundation of diagnosis in modern phlebology. Without ultrasound, I am simply working blind.

In this article I will walk through the procedure from the inside: what happens step by step, why I ask the patient to stand up, what the Valsalva maneuver is, and how to understand the word «reflux» in the report.

Preparation: There Is Almost None

That is good news. Vein duplex ultrasound requires no fasting, no medication changes, and no special fluid intake. All you need to do is:

• wear comfortable clothing that can easily be rolled up to the knee or thigh;
• avoid applying thick cream or oil to your legs — the transducer gel does not make good contact with greasy skin;
• if possible, remove compression stockings 30–40 minutes before your visit so the veins have time to «decompress».

That is all. No complicated rituals.

Why the Phlebologist Performs the Ultrasound Personally

In our specialty it is standard practice for the physician — not a separate technician — to perform the scan. The reason is simple: I am watching a process, not a still image. It matters to me to see how blood moves under load and how valves respond to specific maneuvers. That cannot be reproduced from a printout — it requires the eyes and hands of a specialist in real time.

That is precisely why, when you book an appointment with me, you receive both a consultation and a diagnostic study in a single visit.

How the Study Is Performed: The Stages

The procedure takes 20 to 40 minutes depending on the scope — sometimes both superficial and deep veins need to be assessed.

1. Lying Position

I begin with the patient horizontal. The patient lies on the examination table, I apply gel and move the transducer along the inner surface of the thigh and lower leg. At this stage the deep veins are clearly visible — the femoral, popliteal, and tibial veins. I assess their patency: checking for thrombosis, wall thickening, and whether the lumen is clear.

If I see signs of deep vein thrombosis, this changes the entire management plan — I do not let that patient leave without urgent recommendations.

2. Standing Position — The Key Moment

I then ask the patient to stand up. This is where the most important part begins. In the upright position, the column of blood exerts load on the venous valves — exactly the stress they face in everyday life. Lying down, a valve may look perfectly healthy; standing, it may fail. Missing this moment means missing varicose disease or chronic venous insufficiency.

3. Maneuvers — Valsalva and Compression

While the patient is standing, I ask them to take a deep breath, close their nose and mouth, and bear down — this is the Valsalva maneuver. Intra-abdominal pressure rises sharply, and blood tends to flow back downward. A healthy valve will stop that movement in a fraction of a second. An incompetent valve will let it through.

I also use the compression maneuver: I squeeze the calf muscle with my hand and observe how blood flow responds higher up. This allows me to assess the perforating veins — the ones that connect the superficial and deep systems.

What «Reflux» Means in the Report

When the report states «reflux,» many patients are alarmed by the unfamiliar term. A simple explanation: reflux is reverse blood flow. Normally, blood in the veins travels strictly upward, toward the heart. Valves prevent it from flowing back. When a valve no longer closes completely, blood «falls» downward under load — that is reflux.

• Reflux under 0.5 seconds — considered normal; the valve responds in time.
• Reflux 0.5–1 second — a borderline value that warrants monitoring.
• Reflux over 1 second — clinically significant, especially when accompanied by symptoms.

It is important to understand: the presence of reflux in the report does not automatically mean surgery is needed. It is one parameter that I evaluate in the context of the patient's complaints, clinical picture, and the stage of varicose disease.

What Else Duplex Scanning Reveals

Beyond reflux, a single study gives me:

• vein diameter — important when planning treatment;
• condition of the deep veins — whether there are signs of previous thrombosis or post-thrombotic changes;
• incompetent perforators — I mark their location directly on the skin with a marker if an intervention is planned;
• condition of the saphenofemoral and saphenopopliteal junctions — the sites where the great and small saphenous veins drain into the deep system; this is where valves most commonly fail;
• signs of thrombosis — acute or chronic.

If during the study I detect acute deep vein thrombosis — especially with signs of flotation (a floating thrombus) — immediate hospitalization is required.

If you experience sudden swelling of one leg, pain along the vein, and skin redness — do not delay seeking care: these are signs of thrombosis that require urgent attention.

How Long It Takes and How Often to Repeat

A standard lower-limb vein study takes 20–30 minutes. If pelvic veins need to be assessed or post-operative status evaluated, it may take up to 40–45 minutes.

A follow-up vein duplex ultrasound after treatment (sclerotherapy, laser coagulation, or surgery) is typically scheduled at 1–2 weeks, then at 3 months. For watchful waiting without treatment — once a year or when new complaints arise.

More details about the scope and cost of the study are available on the vein duplex ultrasound page.

Book an Appointment in Tashkent

I perform vein duplex ultrasound personally at every consultation at M-Clinic, Tashkent. If getting to the clinic is difficult, a home visit is available: the equipment allows a full duplex scan to be performed in a home setting.

You can book by phone +998 99 883-93-21 — or through the form on the website. Please bring any prior examination results you have: they help assess how things have changed over time.

This article is for informational purposes only and does not replace a consultation with a qualified physician. If you are experiencing symptoms, please see a specialist.