Carotid ultrasound is a common optional examination in Korean private health checkups, particularly in cardiovascular or cerebrovascular screening packages.
It uses ultrasound and Doppler imaging to examine the carotid arteries in the neck.
The main findings are:
- Carotid intima-media thickness, or IMT
- Carotid plaque
- Carotid stenosis
- Blood-flow abnormalities
The examination is noninvasive, does not use radiation, and does not require contrast material.
However, carotid ultrasound is not recommended as routine screening for every asymptomatic adult. Its usefulness depends on cardiovascular risk factors, previous vascular disease, and the reason for testing.
What Does Carotid Ultrasound Examine?
Carotid ultrasound usually evaluates both sides of the neck, including:
- Common carotid artery
- Carotid bulb and bifurcation
- Proximal internal carotid artery
- Proximal external carotid artery
The examination combines grayscale ultrasound with Doppler measurements.
Grayscale ultrasound shows the arterial wall and plaque, while Doppler evaluates blood flow.
Not every portion of the carotid arteries can be visualized equally well. In particular, the more distal internal carotid artery may not be completely visible on routine neck ultrasound.
IMT, Plaque, and Stenosis
These three terms are related but describe different findings.
IMT
IMT, or intima-media thickness, measures the thickness of the inner layers of the carotid artery wall.
IMT tends to increase with age and cardiovascular risk factors.
Some health screening reports use IMT to estimate a so-called “vascular age,” but this should not be interpreted as a precise measurement of how old your arteries are.
For practical screening purposes, a small isolated increase in IMT is usually less important than definite plaque or significant stenosis.
Plaque
Carotid plaque is a focal atherosclerotic lesion within the arterial wall.
The presence of plaque indicates structural atherosclerosis.
However, plaque does not necessarily mean that the artery is significantly narrowed.
A small plaque may produce little or no stenosis.
Stenosis
Stenosis means actual narrowing of the artery.
Carotid ultrasound uses both the appearance of the artery and Doppler blood-flow measurements to estimate the severity of narrowing.
A report may describe stenosis as:
- No significant stenosis
- Mild
- Moderate
- Severe
Clinically significant stenosis is generally more important than a small isolated change in IMT.
Who May Consider Carotid Ultrasound?
Carotid atherosclerosis becomes more common with age and is associated with cardiovascular risk factors such as:
- Smoking
- Hypertension
- Diabetes
- High LDL cholesterol
- Known coronary artery disease
- Peripheral arterial disease
- Previous stroke or TIA
Having one risk factor does not automatically mean that carotid ultrasound is necessary.
For an asymptomatic person, the decision to add carotid ultrasound should be considered in the context of overall cardiovascular risk rather than simply because the test is available in a screening package.
If you develop sudden neurological symptoms such as one-sided weakness, facial weakness, difficulty speaking, or sudden loss of vision, this is not a health-screening situation. Urgent medical evaluation for possible stroke or TIA is required.
What Can Carotid Ultrasound Not Tell You?
Carotid ultrasound examines the carotid arteries in the neck.
It does not directly evaluate most arteries inside the brain.
If intracranial arteries or cerebral aneurysms need to be examined, tests such as brain MRA or CT angiography may be more appropriate.
A normal carotid ultrasound also does not mean that:
- Coronary arteries are free of atherosclerosis
- Intracranial arteries are normal
- Overall stroke risk is low
Stroke can result from several different causes, including atrial fibrillation, small-vessel disease, intracranial atherosclerosis, and cardiac embolism.
Carotid ultrasound should therefore be considered one source of vascular information rather than a complete stroke-risk assessment.
What Happens If Plaque or Stenosis Is Found?
A small carotid plaque without significant stenosis usually does not lead directly to an invasive procedure.
Instead, the finding may prompt closer attention to cardiovascular risk factors such as:
- LDL cholesterol
- Blood pressure
- Smoking
- Diabetes
- Lifestyle
Medication decisions should be based on overall cardiovascular risk and medical history rather than the ultrasound finding alone.
In particular, do not start aspirin simply because a screening report mentions carotid plaque.
If moderate or severe stenosis is suspected, further evaluation may include:
- Dedicated carotid duplex ultrasound
- CT angiography
- MR angiography
- Neurology consultation
- Vascular specialist consultation
Whether an intervention is appropriate depends on the degree of stenosis, neurological symptoms, age, general health, and expected benefit.
Preparation and Procedure
Carotid ultrasound requires:
- No fasting
- No intravenous contrast
- No radiation
You can generally eat, drink, and take your usual medications normally unless other examinations during the same health checkup require fasting.
During the examination, you usually lie on your back with your head turned slightly away from the side being scanned.
Gel is applied to the neck, and the ultrasound probe is moved along the carotid arteries.
Doppler measurements may produce pulsing or whooshing sounds from the ultrasound machine.
The examination is noninvasive and usually painless.
It generally takes around 10–20 minutes, although additional measurements may be needed when plaque or stenosis is present.
How Much Does Carotid Ultrasound Cost in Korea?
Carotid ultrasound is commonly available as an optional examination or as part of cardiovascular screening packages in Korea.
A practical estimate is approximately:
₩80,000–120,000 (about US$53–80)
using an approximate exchange rate of ₩1,500 per US dollar.
Prices vary by institution and screening package.
Check whether carotid ultrasound is already included before adding it separately.
What Should You Look for on the Report?
The most useful findings are usually:
- IMT: intima-media thickness
- Plaque: whether definite plaque is present
- Stenosis: whether the artery is narrowed and how severe the narrowing is
- PSV: peak systolic velocity, one of the Doppler measurements used when assessing stenosis
For a general health checkup, do not focus too heavily on a small difference in IMT.
The more practical questions are:
- Is definite plaque present?
- Is there significant stenosis?
- If stenosis is present, how severe is it?
Do You Need Repeat Ultrasound?
Not everyone with carotid plaque needs regular repeat ultrasound.
Follow-up depends on:
- Degree of stenosis
- Amount of plaque
- Previous findings
- Overall cardiovascular risk
- Whether progression would change management
A small plaque without meaningful narrowing is very different from moderate or severe stenosis.
If repeat imaging is recommended, previous reports or images are useful for determining whether there has been true progression.
What to Ask When Booking
Before booking, ask:
- Does the examination include both carotid arteries?
- Does the report assess plaque as well as IMT?
- Is Doppler assessment included?
- Will the degree of stenosis be reported if narrowing is found?
- Is the examination already included in my screening package?
- Is an English report available?
- Can previous carotid ultrasound images or reports be compared?
If the examination is advertised as a “vascular age” test, ask what measurements are actually being performed and how the result will be interpreted.
Tips for Foreigners
Bring previous carotid ultrasound or vascular imaging reports if available.
This is particularly useful if you have previously been told that you have:
- Carotid plaque
- Carotid stenosis
- Previous TIA or stroke
- Coronary artery disease
- Peripheral arterial disease
Do not assume that carotid plaque means severe blockage.
Likewise, increased IMT does not mean that the artery is dangerously narrowed.
If stenosis is present, the degree of narrowing is generally more important than the IMT value.
Final Thoughts
Carotid ultrasound is a simple, radiation-free examination that can show atherosclerotic changes in the carotid arteries.
The three main concepts are:
- IMT: arterial wall thickness
- Plaque: focal atherosclerosis
- Stenosis: narrowing of the artery
For health screening, definite plaque and clinically significant stenosis are generally more useful findings than an isolated IMT measurement.
Carotid ultrasound is not a complete cardiovascular or stroke-risk assessment, and it is not necessary as routine screening for every asymptomatic adult.
If you choose to have the test, the most useful question is not your “vascular age.”
It is whether meaningful carotid atherosclerosis or stenosis is present and whether the result should change how your cardiovascular risk is managed.
Have a general question about health checkups in Korea? Feel free to reach out through our Contact page. Please do not submit personal medical information or urgent medical questions.
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