Getting a coronary calcium score test starts with either asking your primary care doctor for a referral or, in many areas, scheduling one directly at an imaging center. The test itself is a quick, noninvasive CT scan that measures calcified plaque in the arteries supplying your heart. Most people pay out of pocket since insurance rarely covers it for screening purposes, with costs typically running around $100 to $200.
Who Should Get the Test
A calcium score test is most useful for people over 40 who have no symptoms of heart disease but fall into a gray zone of cardiovascular risk. Cardiology guidelines from the American College of Cardiology and the American Heart Association specifically recommend considering it for adults at intermediate risk (a 7.5% to 20% estimated chance of a heart attack or stroke over the next 10 years) and those at borderline risk (5% to 7.5%).
Several factors push you into that gray zone where the test can clarify your actual risk. These include a family history of early heart disease, persistently high LDL cholesterol (160 mg/dL or above), high triglycerides (175 mg/dL or above), chronic kidney disease, metabolic syndrome, and inflammatory conditions like rheumatoid arthritis or psoriasis. Women who experienced preeclampsia or early menopause also have elevated baseline risk. People of South Asian descent are flagged as a higher-risk group in current guidelines.
The test is not recommended for people who already have diagnosed heart disease, since it won’t change their treatment plan. It’s also not particularly useful for very low-risk individuals, where the result is almost certain to be zero, or for people already on aggressive treatment for known high risk.
How to Schedule the Scan
Most imaging centers and hospital radiology departments require a doctor’s order before performing a calcium score test. Your primary care physician can write this order, and so can a cardiologist. If your doctor isn’t familiar with the test or doesn’t think you need one, you can ask for a referral to a cardiologist for a second opinion.
Some freestanding imaging centers in certain states allow you to self-refer, meaning you can book and pay for the scan without a prescription. These are often marketed as preventive heart screening packages. If you go this route, you’ll still want to bring your results to a doctor who can interpret them in the context of your overall health.
To find a facility, search for “coronary calcium score” or “heart scan” along with your city name. Hospital systems, outpatient imaging centers, and some cardiology practices all offer the test. Call ahead to confirm pricing and whether they require a referral.
What the Test Costs
A calcium score scan typically costs around $75 to $200 out of pocket, depending on your location and facility. Medicare explicitly does not cover calcium scoring for asymptomatic patients, whether for risk stratification or screening purposes. Most private insurers follow the same policy, treating it as an elective screening test.
Insurance will cover cardiac CT imaging when you have symptoms of coronary artery disease or a suspected structural heart problem. But for the straightforward “I want to know my calcium score” screening scenario, plan to pay cash. Many imaging centers offer upfront pricing and don’t bill insurance at all for this test, which keeps the process simple.
Preparing for the Scan
Preparation is minimal. You’ll be asked to avoid caffeine and smoking for a few hours before the test. Your imaging facility may give you additional instructions, but there’s no fasting requirement and no contrast dye injected into your veins. Wear comfortable clothing without metal snaps or zippers near your chest, since you’ll be lying in a CT scanner.
The scan itself takes roughly 10 to 15 minutes from the time you lie down to when you’re finished. Electrodes are placed on your chest to sync the images with your heartbeat, and the scanner captures cross-sectional images of your coronary arteries. You’ll need to hold your breath for a few seconds at a time. There are no needles, no sedation, and no recovery period. You walk out and go about your day.
Radiation Exposure
A calcium score test delivers about 1 to 2 millisieverts of radiation. For comparison, a standard chest X-ray exposes you to about 0.05 millisieverts, so the calcium scan is roughly 20 to 40 times more than a single chest X-ray. In practical terms, this is still a low dose, comparable to a few months of natural background radiation from your environment. It’s far less than a full cardiac CT angiogram or a nuclear stress test.
Understanding Your Score
Results are reported as an Agatston score, a number that reflects the total amount of calcified plaque detected in your coronary arteries. A computer program analyzes each CT image, identifies areas of calcification, and produces the final number. Results are typically available within a few days.
Here’s what the numbers mean in general terms:
- 0: No detectable calcium. Your risk of a heart attack over the next few years is very low.
- 1 to 99: Mild plaque buildup. Some coronary artery disease is present, but the risk is relatively modest.
- 100 to 299: Moderate plaque buildup. This range often triggers a conversation about cholesterol-lowering medication and lifestyle changes.
- 300 and above: Considered high risk. Scores at this level, or those landing above the 75th percentile for your age, sex, and race, indicate significant plaque burden.
- 1,000 and above: Severe calcification. Aggressive cholesterol management is typically recommended at this threshold.
Your score matters most in context. A score of 150 in a 45-year-old carries different implications than the same score in a 75-year-old, because some calcium accumulation is expected with age. Your doctor will interpret the number alongside your other risk factors.
What Happens After You Get Your Results
A score of zero is genuinely reassuring. For people in the intermediate-risk category, a zero score can justify holding off on statin therapy and continuing with lifestyle measures alone. Some physicians recommend repeating the scan in five to ten years if your initial score is zero, since plaque can develop over time.
Scores of 100 or higher generally move the conversation toward starting or intensifying cholesterol-lowering treatment. The higher the score, the more aggressively your doctor will want to manage your LDL cholesterol, blood pressure, and other modifiable risk factors. At very high scores (1,000 and above), guidelines recommend stepping up treatment further, potentially combining medications to drive cholesterol levels as low as possible.
The calcium score test doesn’t detect soft, non-calcified plaque, which can also cause heart attacks. A score of zero doesn’t mean your arteries are perfectly clean, just that no calcified plaque was found. But calcified plaque is a reliable marker of overall coronary artery disease burden, and decades of research have validated the Agatston score as a strong predictor of future heart events. For many people in the uncertain middle ground of cardiovascular risk, a single 15-minute scan can provide the clearest answer about what their arteries actually look like.