What it is
A coronary artery calcium score, often called a CAC score or heart scan score, comes from a special CT scan of the chest. The scan looks for calcium deposits in the coronary arteries, the vessels that bring blood to the heart muscle. Calcium can build up in these arteries as part of plaque development over time.
The scan is typically quick and does not usually involve an injected dye. A software program measures the calcium it sees and produces a number. A score of zero means no calcium was detected, and higher numbers mean more calcium was seen.
A calcium score is a snapshot of one kind of finding, not a diagnosis. It does not show every type of plaque, and it does not tell you how you feel or what will happen in the future. It is one piece of a larger picture that includes family history, bloodwork, blood pressure, lifestyle and more.
How it’s traditionally been approached
Traditionally, a coronary artery calcium score has been used in preventive cardiology to help refine a person's estimated risk of future heart problems. It is most often discussed for adults who have no known heart disease but are unsure how aggressively to approach prevention.
Clinicians may weigh the result alongside cholesterol levels, blood pressure, blood sugar, smoking history, age and family history. Some people may also hear about it in connection with polygenic risk scores or genetic heart testing, which look at inherited risk from a different angle.
Not everyone is a candidate for the scan, and opinions about who benefits can vary between clinicians. Coverage also varies, and some people pay out of pocket, so it is worth asking your provider and your insurer how it is handled.
How the right cardiologist may help
The right cardiologist, often one focused on prevention, may help by putting your score in context rather than treating it as a stand-alone verdict. A visit generally starts with a conversation about your personal and family health history, current symptoms if any, and your goals and concerns.
Your cardiologist may review bloodwork, take your blood pressure, perform a physical exam and discuss whether a calcium scan makes sense for you at all. If you already have a score, they may explain what it may and may not say about your situation. They may also discuss whether genetic counseling or genetic heart testing is worth considering when family history raises questions.
Helpful questions to ask include: Is a calcium score appropriate for me? What does my number mean alongside my other results? What else should we look at? How will this change, or not change, what we do next? Which parts are covered by my insurance? Only a licensed clinician can decide what is appropriate for you after an evaluation.
The whole-person view
Your heart, your mind and your stress levels are closely connected. Worry about a test result can raise tension, disrupt sleep and affect everyday choices, and the body's stress response can in turn influence how you feel physically. Seeing yourself as a whole person, not just a number, can make the process feel less overwhelming.
If a result leaves you anxious, body-based support such as the approaches offered through Somatic Experiences may help some people feel more settled, and talk therapy through Therapists.plus can offer a space to work through health worries. These are complementary options that sit alongside, never in place of, guidance from your cardiologist.
Somatic Experiences: nervous system regulation →Somatic Experiences: embodiment and movement →Therapists.plus: anxiety panic and ocd →Therapists.plus: mind body connection →
Keep in mind
- A calcium score is not a diagnosis. A score of zero does not guarantee you will never have heart problems, and a higher score does not mean something will happen.
- Licensed professionals should guide your care. Do not make changes to medicines or lifestyle based only on a number you read online.
- If you are considering genetic heart testing, talk with a genetic counselor first. GINA protects against genetic discrimination in US health insurance and employment but does not cover life, disability or long-term-care insurance.
- For emergencies such as chest pain, trouble breathing or fainting, call 911. If you are in emotional crisis, call or text 988.
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Frequently asked questions
What is a coronary artery calcium score?
A coronary artery calcium score is a number from a CT heart scan that reflects how much calcium is in the walls of your coronary arteries. It is used as one piece of information when clinicians think about heart risk. It is not a diagnosis on its own.
What does a coronary artery calcium score of zero mean?
A score of zero means no calcium was detected in your coronary arteries on that scan. That can be reassuring to some clinicians, but it does not rule out all heart risk or all types of plaque. Your cardiologist can explain what it means alongside your other results.
Who might get a coronary artery calcium score?
It is traditionally discussed for adults without known heart disease who want a clearer picture of their risk, particularly when the decision about prevention is uncertain. Whether it is right for you depends on your history and a clinician's evaluation. Ask your provider whether it makes sense in your case.
Does a coronary artery calcium scan hurt or require preparation?
The scan is generally quick and painless, and it typically does not involve an injected dye. Preparation instructions can differ between facilities, so ask the imaging center or your provider what to expect.
Is a coronary artery calcium score the same as genetic heart testing?
No. A calcium score looks at calcium visible in your arteries today, while genetic heart testing looks at inherited DNA variants that may relate to risk or carrier status. Genetic tests do not diagnose heart disease alone, a negative result does not rule out risk, and a variant of uncertain significance is not a diagnosis. A genetic counselor can help you decide whether testing is appropriate.
Does insurance cover a coronary artery calcium score?
Coverage varies by insurer, state and your individual situation, and some people pay out of pocket. Confirm with your insurer and your provider before scheduling. Ask about any costs for the scan and for the visit to review it.
Educational resource. CardioGenes shares general information and connects people with independent cardiologists. It is not medical advice, diagnosis or treatment. Talk with a licensed professional about your health.