When Your CAC Score Is Very High: What Does It Actually Mean—and What Can You Do About It?

If you've had a coronary artery calcium scan and your CAC score came back very high, you're probably wondering the same thing many people do:

How worried should I be—and what am I supposed to do about it?

A CAC score can be an important piece of information about your cardiovascular risk. But a very high number doesn't automatically mean that a heart attack is about to happen, and it doesn't tell you exactly how blocked your arteries are.

What it does tell you is that you have a substantial amount of calcified plaque in your coronary arteries—and that deserves attention.

First: What exactly is a CAC score?

CAC stands for coronary artery calcium.

A CAC scan is a specialized CT scan that looks for calcium deposits in the walls of the arteries supplying blood to your heart.

Calcium is one component of atherosclerotic plaque.

The scan produces a number called an Agatston score.

In general:

• 0 means no detectable coronary calcium.
• 1–99 indicates some plaque.
• 100–399 indicates a more significant amount of plaque.
• 400 or higher indicates extensive calcification.

At very high levels—particularly 1,000 or more—the amount of coronary calcium is considered extensive.

That doesn't mean your artery is 1,000 points blocked.

The number is a measure of calcium burden, not a percentage of blockage.

A very high score does NOT mean your arteries are 90% blocked

This is one of the most important things to understand.

A CAC scan tells you how much calcified plaque is present. It does not tell you precisely how much the artery's opening has narrowed.

A person can have a very high CAC score without having a critical blockage in every artery.

That's partly because atherosclerosis isn't simply a matter of plaque building up inside the artery until the opening gets smaller and smaller.

Plaque can accumulate in the artery wall and cause the artery to remodel outward.

So two people with similar CAC scores can have different patterns of disease and different degrees of narrowing.

That's why a CAC score is best thought of as a measure of coronary plaque burden and risk, not an angiogram.

So why does a very high score matter?

Because the amount of coronary calcium is strongly associated with the amount of coronary atherosclerosis and with future cardiovascular risk.

The American Heart Association describes CAC scores of 1,000 or higher as indicating an extensive plaque burden and very elevated risk.

The National Lipid Association has also noted that CAC scores of 300 or more are associated with substantially increased cardiovascular risk, with risk becoming particularly high at very large scores.

In other words:

A very high CAC score is not a prediction that you will have a heart attack tomorrow.

It is evidence that you've accumulated a significant amount of coronary artery disease over time.

That distinction matters.

The number itself isn't the whole story

A CAC score is one piece of the cardiovascular puzzle.

Your overall risk also depends on things such as:

• Age
• Blood pressure
• Cholesterol levels
• ApoB and LDL-C
• Lipoprotein(a), or Lp(a)
• Diabetes or blood sugar
• Smoking
• Family history
• Kidney function
• Physical activity
• Other medical conditions
• Whether you have symptoms
• Whether there is evidence of significant narrowing in a particular artery

This is why two people with the same CAC score may not have identical treatment plans.

What can you actually do about a very high CAC score?

The good news is that a CAC score isn't a verdict.

You can't make the calcium disappear with a supplement or a special diet.

But you can work on the things that drive cardiovascular risk.

1. Get serious about LDL cholesterol and ApoB

Lowering atherogenic cholesterol is one of the most important tools we have for reducing cardiovascular risk.

LDL-C is familiar to most people.

ApoB is another useful marker because each LDL and related atherogenic particle generally contains one ApoB molecule.

For people at high cardiovascular risk, clinicians may consider substantially lower LDL-C levels than the levels considered acceptable for average-risk adults.

The 2026 ACC/AHA dyslipidemia guideline also emphasizes lower LDL-C goals as cardiovascular risk increases and recommends measuring Lp(a) at least once in adulthood.

For some people, getting LDL-C or ApoB down requires more than one medication.

That can include a statin plus another cholesterol-lowering drug.

The exact target should be individualized with your healthcare professional.

2. Know your Lp(a)

Lp(a), or lipoprotein(a), is a largely inherited cholesterol-carrying particle that can increase cardiovascular risk.

Many people have never had it measured.

Current guidance recommends that adults have Lp(a) measured at least once.

If yours is elevated, it can provide another important piece of the risk picture—particularly when there is a strong family history of premature cardiovascular disease.

3. Don't underestimate blood pressure

High blood pressure can quietly damage arteries for years without producing symptoms.

If you have a very high CAC score, blood-pressure control becomes another important part of reducing overall cardiovascular risk.

Don't judge your blood pressure from a single reading.

Trends matter.

4. Keep exercising—but don't assume more is always better

Regular physical activity is one of the strongest lifestyle tools for cardiovascular health.

Walking, cycling, strength training, aerobic exercise and other forms of physical activity can all have value.

But a very high CAC score does not automatically mean you should stop exercising.

Nor does it automatically mean you should start doing extremely hard workouts.

If you have symptoms, known coronary disease, or questions about how intensely you should exercise, that's a conversation worth having with your healthcare professional.

5. Pay attention to the rest of your lifestyle

There is no magic "CAC diet."

But the dietary patterns associated with cardiovascular health generally emphasize:

• Vegetables and fruit
• Legumes
• Whole grains where appropriate
• Nuts and seeds
• Fish
• Healthy sources of unsaturated fat
• Adequate protein
• Minimally processed foods

And they generally minimize excessive intake of highly processed foods, added sugars and unhealthy fats.

You don't need to eat perfectly.

Consistency matters more than perfection.

6. Don't assume supplements can reverse the calcium

This is an area where the internet can get pretty creative.

There are plenty of products claiming to "clear arteries," "reverse calcification," or dissolve plaque.

Be skeptical.

There is no established supplement that has been shown to remove coronary calcium and reverse coronary artery disease.

A high CAC score is a reason to have a thoughtful risk-reduction strategy—not a reason to start taking a dozen supplements.

What about aspirin?

This is another area where older advice can cause confusion.

Aspirin is not automatically appropriate simply because your CAC score is high.

Aspirin can reduce clotting, but it also increases the risk of bleeding.

Whether the potential benefit outweighs the bleeding risk depends on the individual situation.

Don't start taking aspirin—or increase your dose—simply because you saw a high CAC number without discussing it with your healthcare professional.

Do you need a stress test or an angiogram?

This is where things become more complicated.

A CAC scan tells you about plaque burden.

It doesn't necessarily tell you whether blood flow is significantly restricted.

Other tests can answer different questions.

A stress test can look for evidence that exercise is producing inadequate blood flow to the heart.

Coronary CT angiography can show the arteries themselves and can provide information about plaque and narrowing.

In some situations, an invasive coronary angiogram may be appropriate.

But a very high CAC score by itself does not automatically mean that an asymptomatic person needs an invasive angiogram.

The right next step depends on the entire clinical picture—including symptoms, other test results and overall risk.

Don't let the number become an obsession

There is a psychological trap that can come with CAC testing.

You get a number.

Then you get another number.

Then you start wondering whether your score has gone from 1,316 to 1,500 to 1,700 and whether every increase means your arteries are getting dramatically worse.

It doesn't necessarily work that way.

CAC scores can continue to rise even when cardiovascular risk factors are being treated aggressively.

And calcium is not the same thing as total plaque burden.

A rising calcium score therefore shouldn't automatically be interpreted as treatment failure.

The important question is not simply:

"What is my number?"

It's:

"What does the total picture tell us about my risk, and what can I do about that risk?"

One more thing: you're not the only person dealing with this

A very high CAC score can feel strangely isolating.

You may know people who have never heard of CAC.

You may have friends who think a cholesterol number is the whole story.

And you may find yourself trying to understand medical terminology that you never expected to encounter.

There is a Facebook community called The High CAC Score Club where people with high coronary artery calcium scores can connect with others dealing with the same issue.

Members can share experiences, ask questions, discuss testing and treatment, and compare what they've learned.

Peer communities can be useful—especially when you're trying to make sense of something that can feel overwhelming.

But they should complement, not replace, individualized medical care.

The bigger picture

A very high CAC score is worth taking seriously.

But serious doesn't have to mean frightened.

The score is telling you something important:

You have accumulated a significant amount of coronary atherosclerosis, and your cardiovascular risk deserves careful attention.

That gives you something many people don't have until much later—a warning signal.

You can use that information to look carefully at the things that can be changed:

• LDL-C and ApoB
• Lp(a)
• Blood pressure
• Blood sugar
• Smoking
• Exercise
• Diet
• Weight, when relevant
• Sleep
• Other cardiovascular risk factors

You can't go back and change how much calcium accumulated in your arteries.

But you can change what you do from here.