Cardiac Calcium Score: When to Test and What It Means

One of the most common conversations I have with patients in their 40s and 50s goes something like this: their cholesterol is a little high, maybe their blood pressure is creeping up, and their primary care doctor has started talking about statins. The patient isn't sure. They feel fine. They don't think of themselves as someone with heart disease. And they want to know: how worried should I actually be?

That question — how worried should I actually be? — is exactly what the cardiac calcium score is designed to help answer.

What Is a Cardiac Calcium Score?

A cardiac calcium score (also called a coronary artery calcium score, or CAC score) is a CT scan of your heart. It takes about ten minutes, requires no needles or dye, and delivers a very low dose of radiation. What it's looking for is calcium deposits in the walls of your coronary arteries — the arteries that supply blood to your heart muscle. Calcium in those arteries is a reliable marker of atherosclerosis, the gradual buildup of plaque that can eventually cause a heart attack.

The result is a single number. A score of zero means no detectable calcium was found. Scores above zero are compared against national averages for people of your age, sex, and ethnicity — so a score of 100 means something very different for a 45-year-old than it does for a 70-year-old. It will also give you a percentile score based on age and sex. The lower the percentile the better off you are long term.

What the Numbers Actually Mean

The cardiac calcium score is, in simplest terms, a risk stratification tool. 

Here's how to think about the ranges, based on current cardiology guidelines:

A score of zero is genuinely good news. It's the strongest negative predictor of cardiovascular disease we have — stronger than cholesterol tests, CRP (C-reactive protein), or carotid ultrasound. A zero score tells us that even if your LDL is elevated, your arteries haven't started accumulating calcified plaque yet. That buys time to work on lifestyle without immediately reaching for a prescription. 

A score between 1 and 99 means early-stage calcification is present. Guidelines from the American College of Cardiology suggest this range favors starting statin therapy, particularly after age 55. It also signals that lifestyle intervention should be taken seriously — not just recommended, but actively pursued.

A score of 100 or above indicates meaningful coronary disease is present. At this level, statin therapy is generally recommended, and the focus shifts to both treating the risk aggressively and understanding what else might be driving inflammation in the body.

Who Should Get This Test?

The test is most useful for people in what cardiologists call the "intermediate risk" category — folks who aren't obviously high-risk, but aren't obviously low-risk either. If you're in your 40s or 50s, your blood work is borderline, and you're not sure whether to start medication, a calcium score can give both you and your doctor a much clearer picture. Additionally if you have other risk factors, such as hypertension, diabetes, smoke (hopefully not) or a strong family history such as a parent/sibling who had heart disease diagnosed in their 50s then I would strongly recommend earlier screening. An elevated lipoprotein a or Lp(a), a genetically carried risk in about 20% of Americans, dramatically increases baseline risk for cardiovascular disease and is yet another reason to get the test earlier. 

The ACC/AHA guidelines recommend considering the CAC score for adults between 40 and 75 with intermediate 10-year cardiovascular risk (between 7.5% and 20%) when the decision about starting statins is genuinely uncertain. It can also be useful if you've been hesitant about medication and want a clearer picture of your actual risk before deciding.

I often recommend it for patients who say, "I want to make decisions about my heart health based on what's actually happening in my body, not just estimates." That's a reasonable way to approach it.

While the 10 year risk is important we are as worried about the 20-30 year risk. How do you minimize that long term risk for the #1 killer in the US? 

A Calcium Score Integrative Approach: What We Do With the Results

A calcium score is just information, not a verdict. And like most information in medicine, it's most valuable when it's interpreted alongside everything else we know about you — your inflammation markers, your metabolic health, your stress levels, your sleep, and your family history.

In my practice, a cardiac calcium score is rarely a stand-alone test. I order it alongside a comprehensive lab panel that includes:

• A high-sensitivity CRP (hsCRP), which measures systemic inflammation. Heart disease is fundamentally a disease of inflammation, and knowing your inflammatory burden helps explain why plaque forms and guides treatment. I wrote about this in our post on heart disease — my own hsCRP target is below 1.

• ApoB, which gives a more precise picture of cardiovascular risk than standard LDL alone. A patient can have a "normal" LDL but a high ApoB — meaning they have a lot of small, dense particles, which are the ones most likely to penetrate artery walls and cause damage.

• Lipoprotein(a), or Lp(a) — mentioned above is a genetically determined risk factor that most standard panels miss entirely, but that meaningfully elevates heart disease risk in patients who carry it.

Together, these markers tell a more complete story. The calcium score tells you where you are today. The labs help us understand why you got there, and what levers we have to pull.

A caution that even a zero calcium score is not a ‘get out of jail free card’. It has been shown that up to one third of all patients with cardiac events had a zero calcium score at one time. Calcium scores also do not evaluate soft plaque which can lead to cardiac events over time and are more common in younger patients. It reinforces the need to use the calcium score as a part of the assessment process and not the ultimate decision making factor.

Can You Improve a High Score?

This is the question patients ask most often, and the honest answer is nuanced. Current evidence suggests that once calcium deposits form, lifestyle changes are unlikely to reverse the score itself. The calcium, once laid down, tends to stay. What can change is the trajectory of your disease and your overall risk of a cardiac event.

Lifestyle interventions — diet, exercise, stress management, and sleep — can slow plaque progression and stabilize existing plaques, reducing the likelihood that they rupture and cause a heart attack. A stabilized plaque is a much less dangerous plaque. This is why I never tell a patient with a high score that the damage is done. Quite the opposite: a high score is one of the clearest wake-up calls medicine can give us, and patients who take it seriously can significantly change their long-term outcome.

In practical terms, that usually means committing to a predominantly plant-based diet that's high in fiber and low in saturated fat, a consistent movement routine that builds both cardiovascular endurance and muscle mass, active management of sleep and stress, and a personalized medication plan that might include statins, omega-3 fatty acids, or other targeted therapies depending on what the full lab picture shows.

The Bottom Line

The cardiac calcium score is one of the most underutilized tools in preventive medicine. It's inexpensive (‘cash price’ of $100-150), fast, and gives us a direct window into what's actually happening in your arteries — not just what a risk calculator estimates might be happening.

If you're in your 40s or 50s, have any family history of heart disease, or have been sitting on the fence about cholesterol medication, it's worth asking about. Not because the number will tell you exactly what to do, but because knowing your score — and understanding it in the context of your full health picture — puts you in a position to make genuinely informed decisions about your heart.

That's what a cardiac calcium score integrative approach looks like: not just a number on a report, but a starting point for a real conversation about where you are and where you want to go.

Dignity Integrative offers integrative and functional medicine services in-person in Maryland and the communities surrounding Washington D.C., including Rockville, Germantown, Gaithersburg, Bethesda, and Olney. Book a free 15-minute consultation to learn more.