What Should I Do if My Cardiac Calcium Score Is High?

A high coronary artery calcium (CAC) score signals that calcified plaque has built up in the walls of your heart’s arteries, and the higher the number, the more plaque is present. The score does not tell you whether an artery is blocked right now, but it is one of the strongest predictors of future heart attack and cardiovascular death in people who have no symptoms. What you should do depends on how high the score is, what other risk factors you carry, and how aggressively you and your doctor decide to act on the information.

What the Number Actually Tells You

The score most labs report is called an Agatston score, named after the radiologist who developed it. It multiplies the total area of calcium deposits in your coronary arteries by a weighting factor based on how dense those deposits are, all measured on a non-contrast CT scan of the chest.¹ A score of zero means no detectable calcified plaque was found. Scores between 1 and 99 indicate mild plaque. Scores of 100 to 399 are considered moderate. Anything at or above 400 is severe, and scores above 1,000 are not uncommon in older adults or people with longstanding risk factors.

The relationship between the score and cardiovascular events is well established. Multiple studies have confirmed that as the CAC score rises, so does the likelihood of coronary artery disease, heart attack, and cardiovascular death over the following years.² Both the American College of Cardiology/American Heart Association and the European Society of Cardiology recommend using the CAC score to refine risk estimates in people being considered for primary prevention, meaning those who have not yet had a heart attack or stroke.³

Starting or Intensifying Statin Therapy

For most people, the single most important step after a high calcium score is a conversation with their doctor about statin therapy. Statins reduce the amount of LDL cholesterol circulating in your blood, and lowering LDL is the cornerstone of reducing future cardiovascular events. If you were on the fence about starting a statin because your traditional risk factors put you in a borderline or intermediate category, a CAC score of 100 or higher generally tips the decision in favor of treatment. A score above 300, or one that places you above the 75th percentile for your age and sex, makes the case even stronger.

People who already take a statin and then learn their score is high should not panic or assume the drug is failing. This is where the so-called statin-calcium paradox comes in. Long-term statin use has been associated with higher calcium scores over time.⁴ That sounds alarming, but the explanation is reassuring: statins appear to transform soft, vulnerable plaque into denser, more heavily calcified plaque that is actually more stable and less likely to rupture. A study using serial CT angiography found that statin therapy did not increase total calcified plaque volume but shifted the plaque toward denser calcium.⁵ In other words, a rising Agatston score on statins can reflect plaque stabilization rather than worsening disease. This is one of the clearest cases where chasing the number itself would lead you astray.

Should You Take Aspirin?

Low-dose aspirin for primary prevention has become more controversial in recent years. The general trend in guidelines has been to pull back from routine aspirin use because the bleeding risk can outweigh the benefit in many people. But a high calcium score may change that calculation. A systematic review found that in patients with a CAC score of 100 or higher, aspirin provided a net benefit, as long as the person did not have a high bleeding risk.⁶ Data from the MESA study confirmed this pattern: among participants with a CAC score at or above 100, the number of people you would need to treat with aspirin for five years to prevent one cardiovascular event was lower than the number you would need to treat to cause one major bleed.⁷

The takeaway is not that everyone with a high score should start aspirin on their own. It is that the calcium score gives you and your doctor a more precise way to weigh the trade-off. If you are younger, have no history of stomach ulcers, and your score is well above 100, aspirin may make sense. If you are older, have a history of GI bleeding, or take blood thinners for another reason, the risk-benefit shifts the other way.

Lifestyle Changes That Move the Needle

Medications get the headlines, but lifestyle changes matter a great deal, and the evidence here is not vague hand-waving. The Multi-Ethnic Study of Atherosclerosis (MESA) tracked thousands of adults and scored them on four health behaviors: regular exercise, a healthy diet, not smoking, and maintaining a healthy weight. People who hit all four had dramatically slower calcium progression and substantially lower mortality over about eight years of follow-up. Those with the healthiest lifestyle profile saw their calcium scores progress roughly 11 points per year slower than the reference group, and their risk of dying during the study period was about 80% lower.⁸

No lifestyle change will erase calcium that is already there. Calcified plaque, once deposited, does not meaningfully reverse. But slowing progression matters enormously. Faster calcium progression independently predicts death, even after accounting for the baseline score itself. One large study found that people whose scores progressed beyond a certain threshold had roughly three times the mortality risk of those whose scores remained stable.⁹ So the goal is not to reverse the score but to keep it from climbing fast.

What Happens After the Score: Follow-Up Testing

A calcium score alone does not tell your doctor whether any specific artery is significantly narrowed. It signals risk, not anatomy. If the score is very high, or if you have symptoms like chest pain or shortness of breath during exertion, your doctor may order additional tests.

One common next step is a coronary CT angiography (CCTA), which uses contrast dye to visualize the artery walls and any blockages. In people with very high scores, the accuracy of CCTA gets complicated. Heavy calcification creates bright spots on the images that can obscure the actual lumen of the artery, making blockages look worse than they are. In patients with scores above 1,000, one study found that CCTA correctly identified severe blockages about 76% of the time, with a high rate of false positives.¹⁰ However, when significant blockages are present, the types of plaque that cause them (mixed and non-calcified plaques) are actually easier for CCTA to pick up, which helps offset some of that difficulty.¹¹

Stress testing, either with exercise or a pharmacological agent combined with imaging, is another option. It evaluates whether your heart muscle is getting enough blood flow under demand. Here is an important nuance: even if a stress test comes back normal, a high calcium score still carries prognostic weight. One study found that among patients with normal stress imaging results, those with high calcium scores still had roughly three to four times the risk of cardiovascular events or death compared to those with low scores.¹² A reassuring stress test does not erase the long-term risk that a high calcium score represents.

Repeat Scanning and Tracking Progression

There is no firm consensus on how often to repeat a calcium scan. Some cardiologists recommend a follow-up scan every three to five years to track whether the score is stable or climbing. The argument for tracking is strong: as mentioned earlier, the rate of progression independently predicts mortality, beyond the baseline score alone.⁹ If your score is rising fast despite treatment, that is a signal to reassess whether medications are optimized, whether blood pressure and blood sugar are controlled, and whether lifestyle changes have genuinely stuck.

The radiation from a calcium scan is low, roughly comparable to what you receive from a mammogram or a few months of normal background exposure.¹³ Newer protocols using lower-voltage settings with tin filtration have reduced the dose even further, cutting radiation by about 75% while maintaining scoring accuracy.¹⁴ The cumulative radiation from periodic calcium scans is not a meaningful health concern for most adults.

The Psychological Side of Seeing Your Score

Learning you have a high calcium score is not a neutral experience. A large Dutch trial found that people who received a high CAC result experienced a statistically significant jump in anxiety compared to those who scored low, though the increase did not reach a level considered clinically meaningful in the short term.¹⁵ That spike in anxiety may not be entirely bad. A systematic review of 15 studies found that seeing a calcium score improved medication adherence in the majority of cases.¹⁶ A concrete image of plaque in your arteries can be more motivating than an abstract percentage from a risk calculator.

If anxiety after your scan lingers or interferes with daily life, that is worth mentioning to your doctor. The score is a tool for informed action, not a reason to spiral. People with high scores who respond with medication adherence and lifestyle changes have a meaningfully different trajectory from those who receive the same score and do nothing.

When Diabetes or Metabolic Syndrome Is in the Picture

If you have type 2 diabetes or metabolic syndrome, a high calcium score deserves particular attention. People with these conditions already face elevated cardiovascular risk, and the CAC score provides additional discrimination that standard risk factors miss. In the MESA cohort, the calcium score predicted coronary heart disease events in people with diabetes just as well as in those without, and adding the score to traditional risk models improved the classification of who would and would not go on to have events by a meaningful margin.¹⁷ For people with diabetes, this can matter because some clinicians treat all diabetics as high-risk by default, while others consider younger or recently diagnosed patients as intermediate. The calcium score can resolve that ambiguity and guide how aggressively to treat cholesterol, blood pressure, and blood sugar.

High Scores in Endurance Athletes

One of the more puzzling findings in this field is that lifelong endurance athletes, particularly marathon and ultramarathon runners, tend to have higher calcium scores than you would expect given their otherwise excellent cardiovascular fitness. A study comparing extreme-distance runners to shorter-distance recreational runners found that roughly 73% of the long-distance group had detectable coronary calcium, compared to only 23% of the less-intense runners. The long-distance group was about ten times more likely to have a score at or above the 50th percentile for their age and sex.¹⁸

Another study of masters endurance athletes with low traditional risk profiles found a similar pattern. Male athletes had more atherosclerotic plaques than sedentary men, and only the athletes had scores above 300 or significant artery narrowing. But there was a potentially reassuring detail: the plaques in athletes were predominantly calcified rather than mixed or soft, a composition generally considered more stable.¹⁹ Whether these calcified plaques carry the same risk in a fit athlete as they do in a sedentary person with multiple risk factors is not settled science. If you are a lifelong runner with a high score, the standard risk tables may overestimate your actual danger, but this is an area where discussing your individual situation with a cardiologist familiar with athlete hearts makes a real difference.

Vitamin K2 and the Calcium-in-the-Wrong-Place Theory

You will inevitably come across claims that vitamin K2 supplements can reduce arterial calcification. The biological mechanism is plausible: vitamin K2 activates a protein called matrix GLA protein, which inhibits calcium from depositing in blood vessel walls and soft tissues.²⁰ Meanwhile, some research has linked high-dose calcium supplements (not dietary calcium) with accelerated vascular calcification, prompting the argument that supplemental calcium without adequate K2 is “going to the wrong place.”²¹

The problem is that most of this evidence comes from observational data and laboratory studies. Large, well-designed clinical trials proving that vitamin K2 supplementation slows coronary calcium progression or prevents heart attacks have not been published. It is reasonable to ensure you are getting enough vitamin K through diet, green leafy vegetables and fermented foods are the richest natural sources. But treating vitamin K2 supplements as a substitute for statins, aspirin, or blood pressure management based on the current evidence would be premature.

Sex Differences in What a High Score Means

Women develop coronary artery calcium later in life than men, on average, and at any given age tend to have lower scores. After menopause, the gap narrows. The standard Agatston score thresholds, such as 100 or 300, were largely derived from populations that included both sexes, and whether women need lower thresholds to capture the same level of risk remains an open question. Some evidence from MESA and other cohorts suggests that a score above 100 in a postmenopausal woman may carry event rates comparable to those seen in secondary-prevention populations, which is the level of risk at which statin treatment is strongly recommended.²² The guidance on hormone replacement therapy and its relationship to calcium scoring remains sparse. If you are a postmenopausal woman with a high score, the practical advice, statins, aspirin if appropriate, and aggressive lifestyle changes, does not differ fundamentally from what applies to men, but the threshold at which to act may deserve a more individualized conversation.

Incidental Findings on the Scan

Because the CT scan covers a section of your chest, it can pick up things that have nothing to do with your heart. In one large study, about 43% of patients had at least one incidental finding outside the heart, and roughly half of those findings were considered potentially significant.²³ The most common are lung nodules, especially in older adults and smokers. Other possibilities include liver cysts, breast calcifications, and enlarged lymph nodes.²⁴ Data from the CorCal study found that about 8.5% of patients had a potentially significant incidental finding, with follow-up procedures recommended in nearly two-thirds of those cases.²⁵

The vast majority of these findings turn out to be benign. But occasionally the scan catches something early, like a small lung cancer, that would not have been found otherwise. If your radiology report mentions an incidental finding with a follow-up recommendation, take it seriously. The whole point of acting on a calcium score is that early detection creates the opportunity to intervene; the same principle applies to whatever else the scan happens to reveal.

Familial Hypercholesterolemia and Very High Scores

If you have familial hypercholesterolemia (FH), a genetic condition that causes very high LDL cholesterol from birth, the calcium score takes on even greater predictive power. In a large cohort of FH patients, those with a score above 100 had roughly 32 times the risk of developing atherosclerotic cardiovascular disease compared to those with a score of zero. Adding the calcium score to the standard FH risk model improved the ability to predict who would go on to have events by an estimated 45%.²⁶ For someone with FH, a high calcium score leaves almost no room for doubt: aggressive lipid-lowering treatment, potentially including medications beyond statins, is warranted. Conversely, an FH patient with a score of zero may have room for a slightly less intensive approach, though this is still an area of active research.