Checking for clogged arteries typically involves a combination of physical exams, blood work, and imaging tests that range from simple and inexpensive to highly detailed. There’s no single at-home test that can reliably detect blockages, but several clinical tools can catch them at different stages, often before symptoms appear. Which tests you need depends on your risk factors, your symptoms, and how much detail your doctor needs to plan treatment.
Warning Signs Your Body May Show
Clogged arteries often develop silently over years, but your body sometimes offers clues. In the legs, reduced blood flow can cause cramping or aching during walking that stops when you rest. Skin changes matter too: one leg feeling noticeably colder than the other, wounds on the feet or toes that heal slowly, or asymmetric hair loss on the lower legs can all point to poor circulation. When the skin on your feet turns pale when elevated and reddish when hanging down, that shift suggests significant narrowing in the leg arteries.
For the heart, the classic warning is chest pressure or tightness during exertion. But blockages can also show up as unexplained shortness of breath, fatigue with activity that used to feel easy, or pain that radiates to the jaw, neck, or arm. Some people, particularly women and those with diabetes, experience subtler symptoms like nausea or lightheadedness instead of chest pain.
What Happens During a Physical Exam
A thorough vascular exam is the first step. Your doctor will feel for pulses at several points: the neck, abdomen, groin, behind the knee, and at the ankle. Pulses are graded on a 0 to 3 scale, where 0 means absent and 2 is normal. Weak or missing pulses at the ankle, especially combined with a whooshing sound (called a bruit) over the artery in the groin, are sensitive indicators of peripheral artery disease.
Your doctor will also listen with a stethoscope over the carotid arteries in your neck, the abdomen, and the femoral arteries. A bruit heard over any of these locations suggests turbulent blood flow from a narrowed vessel. The exam may include checking for temperature differences between your limbs and looking at the skin on your feet and lower legs for signs of poor blood flow.
Simple Office Tests
Ankle-Brachial Index
The ankle-brachial index (ABI) is a quick, painless test that compares blood pressure in your ankle to blood pressure in your arm. A technician measures systolic pressure at both locations, then divides the higher ankle reading by the higher arm reading. The result tells your doctor how well blood is flowing to your legs:
- 1.0 to 1.4: Normal circulation
- 0.9 to 1.0: Acceptable, borderline
- 0.8 to 0.9: Mild arterial disease
- 0.5 to 0.8: Moderate arterial disease
- Below 0.5: Severe arterial disease
A reading above 1.4 can indicate stiff, calcified arteries, which is its own concern. The ABI takes about 10 to 15 minutes and requires only blood pressure cuffs, making it one of the most accessible screening tools available.
EKG
An electrocardiogram records your heart’s electrical activity through up to 12 small electrodes placed on your chest, arms, and legs. It takes just a few minutes, involves no risk, and can reveal irregular rhythms or patterns that suggest part of the heart muscle isn’t getting enough blood. An EKG is useful but limited: it may look completely normal even when significant blockages exist, particularly if you’re resting when the test is done.
Blood Tests
Blood work won’t show a blockage directly, but certain markers help gauge your overall arterial health. A standard lipid panel measures cholesterol levels. Beyond that, a high-sensitivity C-reactive protein (hs-CRP) test measures inflammation in your blood vessels. A result below 2.0 mg/L is associated with lower cardiovascular risk, while 2.0 mg/L or above signals higher risk. Your doctor may use this alongside cholesterol numbers and other risk factors to decide whether imaging is warranted.
Stress Tests
A stress test reveals problems that only surface when your heart is working hard. You’ll walk on a treadmill or pedal a stationary bike while the speed or resistance gradually increases. Throughout the test, your heart rhythm, blood pressure, and symptoms are monitored. If you can’t exercise, a medication can be given to make your heart pump as though you were physically active.
Stress tests are often combined with imaging. In a nuclear stress test, a small amount of radioactive tracer is injected so a camera can capture how blood flows through the heart muscle during exertion versus rest. Areas that light up differently may indicate a blockage limiting flow. An exercise echocardiogram uses ultrasound instead, showing how well the heart walls move when pushed to work harder. Both versions are more sensitive than a standard treadmill test alone.
Coronary Calcium Scan
A coronary calcium scan uses a quick CT scan to measure calcium deposits in the walls of your heart’s arteries. Calcium builds up inside plaque, so the amount detected correlates with how much blockage has accumulated over time. The result is expressed as an Agatston score:
- 0: No calcium detected, very low risk
- 1 to 99: Mild plaque buildup
- 100 to 300: Moderate plaque, relatively high risk of a heart attack within 3 to 5 years
- Above 300: Extensive disease, highest risk category
The scan itself takes only a few minutes, requires no injection or dye, and costs between $60 and $400 depending on the facility. The catch is that most insurance plans, including Medicare, consider it a screening test and restrict coverage or don’t cover it at all. You may need to pay out of pocket. Despite the cost barrier, a calcium score is one of the most informative tests for people at intermediate risk who want a clearer picture of where they stand.
CT Coronary Angiography
CT coronary angiography (CCTA) goes a step further than a calcium scan. A contrast dye is injected into a vein, and a CT scanner produces detailed 3D images of the coronary arteries. This lets doctors see not just calcium but also soft plaque and the degree of narrowing in each vessel. A meta-analysis of 29 studies found CCTA has 96% sensitivity for detecting significant blockages, meaning it catches nearly all of them. Its negative predictive value is 94%, so a clean result is highly reassuring.
The trade-off is that CCTA sometimes flags blockages as more severe than they actually are. Its specificity is around 74%, which means some patients will be told they have a significant narrowing that turns out to be less concerning on further testing. Still, it’s a powerful tool for ruling out dangerous blockages without an invasive procedure.
Carotid Ultrasound
A carotid ultrasound uses sound waves to create images of the two large arteries on either side of your neck that supply blood to the brain. The test is painless, takes about 30 minutes, and can detect plaque buildup and narrowing that raise stroke risk. It also measures the thickness of the artery wall. Research published in the Journal of the American Heart Association found that for every small increase in carotid wall thickness, the risk of stroke rises by roughly 25 to 32% and the risk of cardiovascular events rises by 25 to 36%, depending on where the measurement is taken.
This test is most commonly ordered for people who’ve had a stroke or mini-stroke, or who have risk factors like high blood pressure, diabetes, or high cholesterol combined with a bruit heard during a physical exam.
Invasive Angiography
When non-invasive tests strongly suggest a blockage, or when results are inconclusive but symptoms are concerning, a cardiac catheterization (invasive angiography) becomes the definitive test. A thin tube is threaded through an artery in the wrist or groin up to the heart, contrast dye is injected, and real-time X-ray images show exactly where and how severely arteries are narrowed.
This is the gold standard for accuracy, but it’s reserved for situations where the information will directly change treatment. Guidelines from the American College of Cardiology and American Heart Association recommend it for patients whose non-invasive tests show high-risk findings, those with significant angina that isn’t responding to medication, or those who’ve survived a cardiac arrest. The advantage of catheterization is that if a critical blockage is found, it can often be treated during the same procedure with a stent.
Who Should Get Screened
Routine screening for clogged arteries isn’t recommended for everyone. The strongest candidates are people with multiple risk factors: smoking, diabetes, high blood pressure, high cholesterol, family history of early heart disease, or existing atherosclerosis in another part of the body (for example, known peripheral artery disease raises the odds of coronary disease too). The 2024 ACC/AHA guidelines emphasize that clinical assessment starts with recognizing these risk factors, then performing a targeted physical exam before ordering imaging.
If you’re at intermediate risk, meaning you have some risk factors but no symptoms, a coronary calcium scan is often the most practical next step. A score of zero can provide years of reassurance, while any score above zero gives your doctor a concrete number to guide decisions about cholesterol-lowering treatment or lifestyle changes. For people already experiencing symptoms like exertional chest pain, leg cramping with walking, or unexplained shortness of breath, the path typically moves faster: from a physical exam and EKG to a stress test or CT angiography, with invasive angiography if needed.