Finding the right tests…
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Finding the right tests…
Sonography
DOPPLER SINGLE LIMB ARTERIAL checks the arteries carrying blood into one specific arm or leg, the one your doctor has flagged as symptomatic. Using sound waves rather than a needle or dye, the scan traces how easily blood moves down that limb's arteries and flags any point where a vessel has narrowed or closed off. This differs from a venous study of the same limb, which looks at blood leaving the limb instead; here the question is whether enough blood is reaching the tissue in the first place. Doctors order this single-limb version when pain, coldness, or a non-healing sore points clearly to one side, rather than needing both limbs compared side by side.
The scan measures blood flow speed and waveform shape at several points along the arteries of the affected limb, checking for narrowing, blockage, or reduced flow reaching the foot or hand. Where the signal changes shape from one point to the next tells your doctor roughly where along the artery a problem sits, if one exists.
Peripheral artery disease develops when the arteries supplying an arm or leg narrow, usually from plaque building up along the vessel wall. Blood has to work harder to reach the hand or foot, and a common early sign is pain in the leg that comes on with walking and eases with rest, called claudication.
This scan follows the arteries down one arm or leg, reading the sound and shape of blood flow at each point checked. A healthy artery gives a sharp, pulsing signal; a narrowed one produces a flatter, slower signal downstream of the blockage. The scan can also pick up a weak or absent flow signal where an artery has closed off.
Your doctor orders the single-limb version when symptoms clearly point to one side, such as pain, coldness, or a wound on one leg alone. If both limbs need checking for comparison, a separate both-limb arterial version of this scan exists.
The scan uses sound waves, not X-rays, so there's no radiation dose from having it done, even if your doctor wants to repeat it later to track how the artery is responding.
It looks at the arteries carrying blood into your limb, not the veins carrying it back out. A venous scan checks for a blood clot; this arterial scan checks whether enough blood is reaching your hand or foot in the first place.
Your doctor has asked for this version because your symptoms point to one specific arm or leg. If comparing both sides is needed, a separate both-limb arterial study covers that instead.
It can show where an artery in your limb has narrowed or become blocked, usually from plaque buildup, and how that's affecting blood flow further down the limb. It doesn't explain why the narrowing happened, only where it is and how it looks.
No. It uses sound waves to picture blood flow, the same underlying technology used in a pregnancy ultrasound, so there's no radiation involved.
This page is general information about the test, not medical advice. Your own report's reference ranges apply — please discuss your results with your doctor.
No, it's a painless scan. You may feel light pressure from the probe as it's moved along your limb, and a blood pressure cuff may be inflated briefly at a few points.
There's no single preparation instruction that applies to everyone. Ask your doctor or the centre what they'd like you to do beforehand.
It's a key test for peripheral artery disease, but your doctor combines the result with your symptoms, pulse checks, and sometimes other tests before reaching a diagnosis.