Know Your Risk Before It Strikes
Your arteries could be hiding early disease. Find out today.
Heart disease often builds up silently for years before any symptoms appear. A coronary artery calcium (CAC) scan is one of the few tests that can detect this buildup early, before a heart attack happens. It takes about 10 to 15 minutes, requires no injection, and gives your doctor concrete information about what is happening inside your arteries.
This guide covers what a calcium test for the heart actually measures, who should get one, how to read your score, and what to do with the results. If you are checking on how to check your heart health, a CAC scan is one of the most informative options available.
What Is a Coronary Artery Calcium (CAC) Scan?
A CAC scan is a type of CT (computed tomography) scan that looks specifically at the arteries supplying blood to your heart. It detects calcium deposits inside those arteries. Calcium is a marker for plaque, the buildup of fats and other substances that narrows arteries and raises your risk of a heart attack or stroke.
The scan uses low-dose X-rays to take detailed images of your coronary arteries. There is no dye or contrast injection involved. The result is a single number called the Agatston score, which tells your doctor how much calcified plaque is present.
It is not the same as a stress test or an angiogram. A CAC scan does not show how well blood is flowing through the arteries. It shows structural plaque buildup at an early stage, often long before any symptoms develop.
Who Should Get a CAC Scan?
A CAC scan is most useful for people who sit in a middle-risk category. If your risk of heart disease is already clearly low or clearly high, this test adds less value. It is designed for people where the picture is uncertain.
You may be a good candidate for a CAC scan if you:
- Are between 40 and 70 years old with at least one cardiovascular risk factor
- Have a family history of early heart disease
- Smoke or have smoked in the past
- Have high blood pressure, high cholesterol, or diabetes
- Are overweight or have an inactive lifestyle
- Are unsure whether to start statin therapy and want more data before deciding
A CAC scan is not recommended if you have already had a heart attack, a coronary stent, or bypass surgery. Other tests are more appropriate in those cases. It is also not recommended during pregnancy. If you are noticing signs of poor heart health, speak with your doctor about which test is right for you.
What Happens During a CAC Scan?
The procedure is simple and takes about 10 to 15 minutes from start to finish. Here is what to expect.
- Avoid food, caffeine, and tobacco for about four hours before the scan
- You will change into a hospital gown and remove any metal jewelry near your chest
- Small electrode patches are placed on your chest to monitor your heart rhythm during the scan
- You lie flat on a movable table that slides into a doughnut-shaped CT scanner
- The technician will ask you to hold your breath for 10 to 20 seconds at a time while images are taken
- The scanner rotates around your body without touching you
You can drive yourself home and go about your normal day immediately after the test. There are no needles, no dye, and no recovery time required.
Understanding Your Calcium Score (Agatston Score)
Your result comes as a number called the Agatston score. This score reflects both the size and density of calcium deposits found in your coronary arteries. Here is how to read it.
| Calcium Score | What It Means | Typical Next Steps |
| 0 | No calcium found — low heart attack risk in the next 2 to 5 years | Maintain a heart-healthy lifestyle and reassess in 3 to 5 years if risk factors remain |
| 1 to 100 | Mild plaque present — some coronary artery disease detected | Diet and exercise changes are usually the first step; statin therapy may be discussed |
| 100 to 400 | Moderate plaque — relatively high risk of heart attack over the next 3 to 5 years | Statin therapy is typically recommended along with lifestyle changes and closer monitoring |
| Above 400 | Extensive plaque — high risk; strong evidence of coronary artery disease | Cardiology referral is common; aggressive treatment and further testing are often needed |
A score of zero is a strong reassurance, but it does not mean your risk is zero forever. Soft plaque, which contains no calcium yet, will not show up on this scan. Your doctor will always read your score in context with your other risk factors, blood pressure, cholesterol levels, family history, and lifestyle.
Benefits and Limitations of the CAC Scan
What It Does Well
- Detects calcified plaque years before symptoms appear
- Helps clarify borderline or uncertain heart disease risk
- Guides decisions about starting statin therapy
- Non-invasive with no dye or needles involved
- Can motivate lifestyle changes such as better diet, exercise, and weight management. See: best cardiovascular exercise for heart health
What It Cannot Do
- It does not detect soft or non-calcified plaque, which can still cause heart attacks
- It cannot show blood flow or blockages the way an angiogram can
- A score of zero does not rule out all cardiovascular risk
- It should not replace other heart tests or standard risk calculations
CAC Scan Cost and Insurance Coverage
A CAC scan typically costs between $100 and $400 when paid out of pocket. Many insurance plans do not cover it because it is considered a preventive screening test rather than a diagnostic one.
Some healthcare systems and imaging centers offer it at a reduced rate for cash-pay patients. Major providers like Mayo Clinic, Cleveland Clinic, and Johns Hopkins offer CAC scans. Ask your doctor for a referral or check with local hospital radiology departments for current pricing in your area.
What to Do After Your Calcium Test Results
A zero score is good news but not a reason to stop being proactive about heart health. Your doctor will still review all your other risk factors and may recommend reassessment in three to five years.
If your score is above zero, the next steps depend on the number and your overall risk profile. Common recommendations include:
- Starting statin therapy to slow plaque progression and protect artery walls. Learn more: high blood pressure and heart disease risk
- Dietary changes, including a plant-based diet for heart health, which is linked to slower atherosclerosis progression
- Regular aerobic exercise. See our guide on the best cardiovascular exercise for heart health
- Smoking cessation if you currently smoke
- Weight management and blood pressure control
- Further cardiac testing if your score is high, including referral to a cardiologist. Understand the difference between stroke and heart attack and why both matter
A CAC scan is rarely repeated once you have had an abnormal result. It is most useful the first time around, when it is helping establish whether you have coronary artery disease at all.
Know Your Risk Before Symptoms Start
A calcium score tells you part of the story. The Baledoneen Method goes further with advanced cardiovascular testing, arterial wall assessment, inflammation markers, and full genetic risk analysis to give you a complete and specific picture of your heart disease risk, years before a cardiac event can occur.
>>> Learn About the Baledoneen Method
Frequently Asked Questions
What is a normal calcium score for my age?
A score of zero is considered normal at any age and means no calcified plaque was found in your coronary arteries. Scores above zero increase in significance with age, and your doctor will compare your result to others in your age and sex group to give context to what was found.
How often should I get a CAC scan?
If your first scan comes back as zero and you have ongoing risk factors, a repeat scan every three to five years may be useful to monitor whether your risk is changing. If your scan showed calcium, repeating the test generally adds no useful information because treatment decisions are already guided by the abnormal result.
Is a cardiac calcium test worth it if I have no symptoms?
Yes, for people in the intermediate-risk category, a CAC scan is one of the best ways to detect coronary artery disease before any symptoms appear. Heart disease can progress silently for many years, and early detection gives you and your doctor more time and options to prevent a serious cardiac event.
Why doesn’t insurance cover the CAC scan?
Most insurance plans classify the CAC scan as preventive screening rather than diagnostic testing, which often means it is not covered. The cost is typically between $100 and $400 out of pocket, and many people find it a worthwhile personal investment given the information it provides about long-term heart attack risk.
What preventive measures should I take if my calcium score is elevated?
Your doctor will likely recommend statin therapy to stabilise existing plaque, along with diet changes, regular aerobic exercise, blood pressure control, and smoking cessation if relevant. Higher scores may also lead to a cardiology referral and additional heart testing to assess blood flow and overall cardiac function.
Medical Disclaimer: This article is for educational purposes only. It is not a substitute for professional medical advice. Speak with your doctor or cardiologist to determine whether a coronary artery calcium scan is appropriate for you.
Key Sources
Mayo Clinic: Coronary Calcium Scan
About the Author: Christine Cooper
