A heart calcium score tells you how much calcified plaque has built up in your coronary arteries and what that means for your risk of a heart attack or stroke.
- Scores range from 0 to 1,000+. A score of zero suggests a very low short-term risk, while a score above 400 signals a high burden of coronary artery disease.
- Age shapes interpretation. A score that is normal for a 65-year-old may be concerning in a 45-year-old, which is why interpreting calcium score results always involves age-based context.
- It is not the same as a stress test. The calcium test for heart disease measures structural plaque buildup, while a stress test for heart disease evaluates how well the heart functions under physical demand.
Most people do not think about their arteries until something goes wrong. But damage from plaque buildup often develops silently, over decades, long before chest pain or shortness of breath ever appears. The calcium test for heart disease, also called a coronary artery calcium (CAC) scan, gives physicians a way to detect that buildup early, often before symptoms begin.
This guide explains what a heart calcium score means, how results are interpreted based on age, how the test compares to a stress test for heart disease, and what you should do if your number is high.
What Is the Calcium Test for Heart Disease?
A calcium test for heart disease is a noninvasive imaging test that uses a computed tomography (CT) scan to look for calcium deposits in the walls of the coronary arteries. These deposits are a marker of atherosclerosis, a condition in which plaque (made up of fat, cholesterol, calcium, and other substances) accumulates and narrows the arteries.
The test produces a number called an Agatston score, which reflects both the area and density of calcium found in the arteries. According to Mayo Clinic, results from this scan can help determine a patient’s risk of heart attack or stroke and guide treatment decisions for coronary artery disease.
Unlike a blood test or a blood pressure reading, this scan provides a direct look at what is happening inside the arteries themselves. That makes it one of the most precise tools available for early cardiovascular risk assessment.
How Does the Calcium Score Test Work?
The procedure is quick and straightforward. A technologist places electrode patches on the chest to monitor the heart’s rhythm, and a CT scanner captures synchronized images of the coronary arteries.
The entire scan takes about 10 to 15 minutes. No contrast dye is injected, and no needles are involved. Patients are typically asked to avoid caffeine and tobacco for a few hours beforehand, and most return to normal activities immediately after.
The test does involve a small amount of radiation, roughly equivalent to the natural background radiation a person is exposed to in one year, according to Cleveland Clinic. The radiation exposure is generally considered safe, though it is not recommended for pregnant women.
What Do the Numbers Mean? Interpreting Your Calcium Score
Interpreting calcium score results correctly requires understanding what each range signals about coronary artery health. Here is how the scoring breaks down:
- Score of 0: No calcium detected. This suggests a low risk of a heart attack in the next two to five years.
- Score of 1–10: Minimal calcium present. Early signs of coronary artery disease may exist, though risk remains relatively low.
- Score of 11–100: Mild plaque buildup. The risk of heart disease is moderate, and lifestyle or medical intervention may be considered.
- Score of 101–400: Significant plaque buildup. The risk of a heart attack increases meaningfully, and further evaluation is usually warranted.
- Score above 400: Extensive calcification. This level is associated with a high risk of severe coronary artery disease and serious cardiac events.
A score between 100 and 300 is associated with a relatively high risk of heart attack or other cardiac event over the next three to five years. A score above 300 suggests even more advanced disease.
It is important to understand that a positive result, any score above zero, confirms the presence of coronary artery disease, even if you have no symptoms. The higher the number, the greater the concern.
How Does Calcium Score by Age Affect Results?
Interpreting a calcium score without factoring in age can be misleading. Plaque naturally tends to accumulate over time, so calcium score by age expectations differ significantly across life stages.
Here is a general framework for thinking about calcium score by age:
- Ages 20–39: The score should ideally be zero. Any calcium detected at this age warrants close attention.
- Ages 40–59: Some mild plaque may be present, but scores above 100 are a red flag regardless of the absence of symptoms.
- Ages 60 and older: Slightly higher scores may reflect the natural aging of arteries, but scores above 300–400 still indicate significant risk.
Men tend to develop calcified plaque earlier than women, which means calcium score by age benchmarks can also differ by sex. A cardiologist can help place your specific number in the right context by comparing it against population norms for your age and sex group.
How Does the Calcium Test for Heart Disease Compare to a Stress Test for Heart Disease?
Patients often wonder whether they need a calcium scan, a stress test for heart disease, or both. The answer depends on your symptoms and clinical situation.
A stress test for heart disease — also called an exercise stress test or cardiac stress test — evaluates how well the heart pumps blood when it is under physical or pharmacological stress. It is a functional test, designed to detect obstructed blood flow that may cause symptoms like chest pain, shortness of breath, or irregular heartbeat during exertion.
Physicians typically order a stress test for heart disease when a patient is experiencing symptoms or when there is a concern about an existing blockage.
The calcium test for heart disease, on the other hand, is a structural test. It measures the amount of calcified plaque in the arteries and is best suited for asymptomatic patients who have an intermediate risk of heart disease — those who are not clearly high-risk or low-risk based on traditional factors alone.
In short:
- Choose the calcium test when you have no symptoms and need to know your underlying risk level
- Choose a stress test for heart disease when symptoms are present or blood flow needs to be assessed
In some cases, a physician may order both tests to get a complete picture of cardiovascular health.
Who Should Get the Calcium Test for Heart Disease?
Not everyone needs a calcium scan. The test is most useful for people between the ages of 40 and 70 who have an elevated — but not clearly high — risk of heart disease and no current symptoms.
Candidates most likely to benefit include people who:
- Have a family history of early coronary artery disease
- Have smoked or currently smoke
- Have high cholesterol, type 2 diabetes, or high blood pressure
- Are overweight or obese
- Live a sedentary lifestyle
The test is generally not recommended for people who already have a confirmed diagnosis of coronary artery disease, have had a prior heart attack, or are known to be at very high risk because treatment decisions in those cases do not depend on a calcium score.
What Happens If Your Calcium Score Is High?
A high calcium score is not a diagnosis on its own, but it is a meaningful signal. Physicians use the result alongside other clinical information to develop a personalized treatment plan.
Common next steps after a high score include:
- Statin therapy: Medications such as atorvastatin (Lipitor) or rosuvastatin (Crestor) help lower LDL cholesterol and reduce further plaque accumulation.
- Blood pressure management: Controlling hypertension reduces strain on the arterial walls.
- Lifestyle modifications: A heart-healthy diet, regular aerobic exercise, and smoking cessation can slow the progression of coronary artery disease.
- Additional testing: A stress test for heart disease, coronary CT angiography, or other imaging studies may be ordered to gather more detail.
- Specialist referral: A cardiologist may become involved in managing care, particularly for scores above 400.
The goal is not to panic over a number but to use it as a starting point for action. Even patients with high scores can meaningfully reduce their cardiovascular risk with the right interventions.
Frequently Asked Questions (FAQ)
Below are answers to common questions about coronary artery calcium (CAC) scoring, insurance coverage, and what your results mean for your heart health.
What is a normal calcium score?
A score of zero is considered normal. It indicates that no calcified plaque was detected in the coronary arteries and suggests a very low risk of a heart attack in the near term. However, a zero score does not guarantee the absence of all forms of coronary artery disease, as soft plaque (which does not contain calcium) is not detected by this test.
Can a calcium score go down over time?
The total calcium burden in the arteries does not typically decrease. However, aggressive management can slow the rate of progression significantly. Some studies suggest that intensive treatment can stabilize or even reduce plaque volume over time.
How is interpreting calcium score different for men and women?
Men generally develop coronary artery calcium earlier than women of the same age. This means that a score considered borderline in a 55-year-old man may carry more clinical concern in a 55-year-old woman, since women tend to have lower scores at that age. Physicians use sex-specific percentile comparisons to put each score in context.
How does the calcium test for heart disease differ from a standard chest CT scan?
A standard chest CT scan is not designed to detect or quantify coronary calcium. The CAC scan uses specific imaging protocols and software to measure calcium deposits in the coronary arteries precisely. While a chest CT may incidentally note calcification, it does not produce an Agatston score or provide a formal cardiac risk assessment.
Does a high calcium score mean I will have a heart attack?
Not necessarily. A high calcium score indicates an elevated risk of future cardiovascular events, but it is not a guarantee that a heart attack will occur. Many patients with high scores never experience a cardiac event, particularly when they pursue appropriate medical treatment and lifestyle modifications. The score is a tool for risk-informed decision-making, not a prediction of inevitable outcomes.
Calcium Test for Heart Disease in Boca Raton, FL
If you want to know where you stand before a problem develops, the calcium test for heart disease offers some of the clearest answers available. Early detection changes outcomes, and the physicians at Advanced Heart and Vascular Institute in Boca Raton, FL, are specialists in exactly that kind of preventive cardiovascular care.
Dr. Eli Levine and Dr. Michael Schechter provide personalized, evidence-based cardiac evaluations for patients across Palm Beach County, including comprehensive CAC scoring, risk assessment, and individualized treatment planning. Whether you are trying to understand a score you have already received or are considering the test for the first time, their team can guide you through every step.
Call (561) 235-5621 or request an appointment online to schedule your consultation today. Protecting your heart starts with knowing what is happening inside it.