Carotid Doppler Ultrasound

Doctors order this scan when they need to assess the carotid arteries for narrowing or blockage caused by a build-up of plaque (fatty deposits on the artery wall), which can raise the risk of stroke.

• Recent transient ischaemic attack (TIA, sometimes called a mini-stroke), where symptoms lasted less than 24 hours.
• Stroke or suspected stroke, to find the source of a clot.
• A bruit (an abnormal whooshing sound heard through a stethoscope over the neck), suggesting turbulent blood flow.
• Carotid artery disease already diagnosed, requiring monitoring of how fast plaque is building up.
• Before major heart surgery such as coronary artery bypass, to check artery health.

Carotid Doppler ultrasound is one of the safest tests in medicine. It uses sound waves, not radiation, and nothing enters your body, so the recognised risk list is very short.

• Mild skin discomfort from the gel applied to the neck, which wipes off easily.
• Slight pressure sensation from the transducer, rarely causing any pain.
• In very rare cases, brief light-headedness if the transducer presses on a sensitive area of the neck. This passes within seconds.
• No radiation exposure and no injection of dye or contrast agent, so allergic reactions are not a concern with this test.

Almost no special preparation is needed for this scan. You can eat, drink, and take your regular medications as normal on the day of the test. If your doctor gives you different instructions, follow those instead.

Wear a top that gives easy access to your neck, or be prepared to change into a hospital gown. Remove any jewellery around the neck, such as necklaces or chains, before the appointment. Smoking narrows blood vessels temporarily, so most departments ask you to avoid smoking for several hours beforehand, as it can affect the flow readings.

No blood tests or other imaging studies are routinely required before the scan itself, though your doctor may have already ordered these for another reason.

• Step 1. You lie on your back on a padded examination table with a pillow under your shoulders to tilt your chin upward and expose the neck.
• Step 2. A technician or doctor applies a clear water-based gel to the sides of your neck. The gel helps the transducer make full contact with the skin.
• Step 3. The transducer is moved slowly along each side of your neck. You may hear whooshing sounds through a speaker. These are the sounds of your blood moving.

Because the scan is non-invasive, meaning nothing pierces the skin, there is no wound to care for and no recovery period. Most people leave the imaging suite and return to their normal day straight away.

• You can drive, eat, drink, and continue all regular activities immediately after the scan.
• No medication is given during the test, so there is nothing to taper or stop afterwards.
• If gel remains on your skin, wiping with a tissue or washing with water is all that is needed.
• Ask the reception desk how results will be delivered, whether by written report, an online patient portal, or a follow-up consultation.
• If the scan was ordered after a TIA or stroke symptoms, follow whatever activity restrictions your neurologist has already put in place, as these relate to your condition, not the scan itself.

The price of a carotid Doppler ultrasound varies considerably from country to country and even between hospitals in the same city, largely because of differences in equipment, staffing, and what the local healthcare market charges for imaging services.

• Hospital class and country: a private tertiary hospital in a major city typically charges more than a specialist outpatient clinic or a mid-tier hospital.
• Complexity of the scan: a routine bilateral (both sides) study is priced differently from a detailed vascular mapping that includes extra measurements or extended Doppler analysis.
• Radiologist or specialist interpretation fee: this may be bundled into one price or billed separately, depending on the facility.
• Repeat or follow-up scans: if serial monitoring is needed to track plaque progression over time, each session is usually charged individually.
• Combined appointments: if the ultrasound is performed on the same visit as a neurology consultation or other tests such as an EKG or blood work, those items are normally billed separately.