About this procedure
Duplex arterial ultrasound examines blood supply through accessible arteries of the legs or arms using structural ultrasound images and Doppler flow measurements.
What the examination or consultation can show
It can detect features suggesting arterial narrowing, plaque or altered blood flow. The examination is directed at the arterial system; scanning the veins is a distinct test that answers different questions.
When an assessment may help
Leg pain with walking that eases after rest, cold limbs, slow-healing wounds, suspected peripheral arterial disease or follow-up after vascular intervention may lead to arterial assessment.
Important limitations and differences
Circulatory symptoms can also arise from nerve, joint or venous problems. Deep vessel segments, severe calcification or swelling can make ultrasound interpretation more difficult; other imaging and a vascular specialist's review may be necessary.
Preparation and procedure
A transducer is placed along accessible arteries of the limb, measuring vessel dimensions and flow speeds. Little preparation is usually required, but the whole affected limb may need to be exposed. Bring old examination results for comparison.
Next steps and follow-up
The scan is not treatment. Decisions about risk factors, medical treatment, further tests or vascular intervention depend on a clinician's evaluation of symptoms, pulses, examination and imaging.
When to seek urgent care
A suddenly painful, pale or cold limb, new numbness or loss of movement can signal acute limb ischaemia. Seek emergency help without delay and call 103; waiting for an outpatient scan risks permanent injury.
Related health information
Head and neck vessel ultrasound; Joint and soft tissue ultrasound; Atherosclerosis.
Signs and symptoms
Diagnosis and tests
Care and treatment approaches
When to seek urgent care
Frequently asked questions
Are artery and vein ultrasound the same examination?
No. They examine different blood vessels and problems, even though some appointments may include both.
Can duplex ultrasound detect arterial plaque?
It may show plaques, narrowed segments and flow changes, but treatment is based on the whole clinical picture.
Should I bring a doctor's referral?
A referral helps define the area and clinical question. Bring it and prior results when available.
Important information
A medical consultation is needed for diagnosis and treatment recommendations.
Self-treatment can be harmful to your health.
