Getting a coronary calcium score involves a quick, noninvasive CT scan of your heart that typically costs between $75 and $300 out of pocket. The process is straightforward: determine whether you’re a good candidate, schedule the scan (sometimes without a doctor’s referral), and sit through a procedure that takes about 15 minutes total. Here’s what to know at each step.
Who Should Get the Scan
A coronary calcium scan isn’t meant for everyone. It’s most useful for people in a gray zone of cardiovascular risk, where the result could change what they do next. The American Heart Association identifies several groups who benefit most:
- Adults ages 40 to 55 with a 5% to 7.5% ten-year risk of heart disease and at least one additional risk factor
- Men ages 55 to 80 and women ages 60 to 80 with few risk factors who want clarity on whether statin therapy makes sense
- People reconsidering statins after stopping treatment due to side effects
- Adults under 40 with multiple major risk factors or a family history of early heart disease
The scan is not recommended for people who already have no symptoms and low overall risk, unless they have a strong family history of premature coronary heart disease. It’s also unnecessary if you already have confirmed heart disease, since the result wouldn’t change your treatment plan.
How to Schedule the Scan
Most people start by asking their primary care doctor or cardiologist for a referral. Your doctor can order the scan, and this route makes it easier to discuss the results afterward and decide on next steps together. That said, some imaging centers don’t require a referral at all. Cedars-Sinai, for example, lets patients book directly, though they do ask for the name of a doctor you’ve seen within the past two years.
Freestanding imaging centers, hospital radiology departments, and some cardiology practices all offer the scan. If you’re paying out of pocket, calling around to compare prices is worth the effort, since costs can vary significantly between facilities in the same city.
What It Costs
Most people pay between $75 and $300, depending on location and facility. The reason for the out-of-pocket cost: Medicare does not cover coronary calcium scoring when it’s done as a standalone screening test. Medicare classifies it as “not medically necessary” when reported in isolation, and even when performed alongside a CT angiogram, there’s no separate reimbursement for the calcium score portion.
Private insurance coverage varies. Some plans cover the scan for patients who meet specific risk criteria, but many treat it as elective screening. Call your insurer before scheduling to find out where you stand. Given the relatively low cost, many people simply pay cash.
How to Prepare
Preparation is minimal. Avoid food, drinks, caffeine, and tobacco products for four hours before your appointment. That includes coffee, tea, energy drinks, and nicotine in any form. Caffeine and nicotine can affect your heart rate, which matters because the scan needs your heart beating steadily to capture clear images. Wear comfortable clothing without metal snaps or zippers near your chest, since you’ll be lying inside a CT scanner.
What Happens During the Scan
The actual CT scan takes only a few minutes. You’ll lie on a table that slides into a doughnut-shaped scanner, and technicians will attach electrodes to your chest to monitor your heart rhythm. You’ll be asked to hold your breath for 10 to 20 seconds at a time while the machine captures images of your coronary arteries. The entire visit, including check-in and setup, usually takes about 10 to 15 minutes.
No contrast dye is injected, and there are no needles involved. Radiation exposure is low, roughly 1 to 2 millisieverts. For comparison, that’s similar to the natural background radiation you absorb over about six months of everyday life.
Understanding Your Score
Your result comes as a number called an Agatston score, which quantifies how much calcium has built up in the walls of your coronary arteries. Calcium deposits form inside arterial plaques, so the score serves as an indirect measure of how much plaque is present. The ranges break down like this:
- 0: No calcium detected. This suggests a low chance of heart attack in the coming years.
- 1 to 99: Mild plaque deposits. Some buildup is present but overall risk remains relatively low.
- 100 to 300: Moderate plaque deposits, associated with a relatively high risk of heart attack or other heart disease over the next three to five years.
- Over 300: More extensive disease with higher heart attack risk.
Your score also gets compared to other people of the same age, sex, and ethnicity, producing a percentile ranking. A raw score of 50 means something different for a 45-year-old than for a 75-year-old, so that percentile context matters.
How Results Affect Treatment Decisions
The real value of a calcium score is how it sharpens the conversation about prevention. For people at borderline or intermediate risk (a 5% to 20% ten-year chance of a cardiovascular event), the score acts as a tiebreaker when the decision about treatment isn’t clear-cut.
A score of zero generally supports holding off on statin therapy, even in groups where you might expect to start one. Current guidelines suggest that adults 76 to 80 with otherwise manageable cholesterol levels and a zero score can reasonably defer statins. On the other end, a score over 100 favors starting statin therapy regardless of age. Scores between 1 and 99 land in the middle: for people over 55, guidelines lean toward statin use, while younger patients with any calcium present are typically advised to intensify lifestyle changes and may be reclassified into a higher risk category.
Beyond medication decisions, a nonzero score often motivates people to take diet, exercise, and blood pressure management more seriously. Seeing a concrete number that reflects plaque in your arteries tends to make abstract risk feel real, which can be a powerful motivator for behavior change.