What is Coronary Calcium Scan? Purpose, Levels/Procedure & Results

A coronary calcium scan is a quick, painless heart test that takes pictures of your heart's arteries to check for calcium buildup. This special CT scan can spot early signs of heart disease before you feel any symptoms, giving you and your doctor valuable information about your heart health.

Think of it as a snapshot of your heart's plumbing system. The scan looks for calcium deposits in your coronary arteries, which are the blood vessels that supply oxygen to your heart muscle. These calcium spots often appear where plaque has formed, making this test a useful tool for understanding your risk of heart problems down the road.

What is coronary calcium scan?

A coronary calcium scan uses computed tomography (CT) technology to create detailed images of your heart's blood vessels. The scan specifically looks for calcium deposits that have built up in the walls of your coronary arteries over time.

These calcium deposits act like markers, showing where atherosclerosis (hardening of the arteries) has occurred. When plaque forms in your arteries, calcium can accumulate there as part of the body's natural response. The more calcium present, the more plaque you likely have.

The test produces a calcium score, which is a number that reflects how much calcium is in your coronary arteries. This score helps your doctor assess your risk of having a heart attack or developing other heart problems in the future.

Why is coronary calcium scan done?

Doctors recommend coronary calcium scans primarily to evaluate heart disease risk in people who don't have symptoms yet. This test is particularly helpful for people at intermediate risk of heart disease, where the results can guide important decisions about prevention and treatment.

Your doctor might suggest this scan if you have risk factors like high blood pressure, high cholesterol, diabetes, or a family history of heart disease. The scan can help determine whether you need more aggressive treatment to prevent heart problems, such as starting cholesterol-lowering medications or making lifestyle changes.

The test is also valuable when other risk assessment tools give unclear results. Sometimes traditional risk calculators put you in a gray area where it's hard to decide on the best treatment approach. A calcium scan can provide the additional information needed to make clearer decisions about your care.

Additionally, the scan can motivate lifestyle changes. Seeing actual evidence of calcium buildup in your arteries can be a powerful wake-up call that encourages you to take heart-healthy steps like improving your diet, exercising more, or quitting smoking.

What is the procedure for coronary calcium scan?

The coronary calcium scan procedure is straightforward and typically takes about 15 minutes from start to finish. You'll lie on a table that slides into a CT scanner, which looks like a large donut-shaped machine.

During the scan, you'll need to hold your breath for short periods (usually 10-20 seconds) while the machine takes pictures. The technologist will give you clear instructions about when to hold your breath and when you can breathe normally again. This breath-holding helps ensure the images are clear and accurate.

The actual scanning time is very brief, usually taking only a few minutes. You won't feel anything during the scan itself, though you might hear some whirring or clicking sounds from the machine. The table you're lying on might move slightly as the scanner captures images from different angles.

No contrast dye is needed for this test, which means you won't receive any injections or need to drink any special liquids. This makes the procedure simpler and reduces the risk of allergic reactions that can sometimes occur with contrast materials.

How to prepare for your coronary calcium scan?

Preparing for a coronary calcium scan is relatively simple since it's a non-invasive test. You can eat and drink normally before the scan, and you don't need to stop taking any of your regular medications unless your doctor specifically tells you otherwise.

You should wear comfortable, loose-fitting clothing without metal objects. Avoid shirts with metal buttons, underwire bras, jewelry, or anything with metal decorations. These items can interfere with the imaging and may need to be removed before the scan.

If you have a pacemaker, defibrillator, or other implanted medical devices, make sure to tell your doctor and the imaging team beforehand. While these devices usually don't prevent the scan, the medical team needs to know about them to ensure your safety and get the best possible images.

It's helpful to arrive a few minutes early to complete any necessary paperwork and get settled. The staff will review the procedure with you and answer any questions you might have before the scan begins.

How to read your coronary calcium scan?

Your coronary calcium scan results are reported as a calcium score, also called an Agatston score. This number represents the amount of calcium found in your coronary arteries, with higher numbers indicating more calcium buildup.

A score of zero means no calcium was detected in your coronary arteries. This is excellent news and suggests a very low risk of heart disease. People with zero calcium scores typically have less than a 1% chance of having a heart attack in the next 10 years.

Scores between 1 and 99 indicate mild calcium buildup. This suggests some early atherosclerosis is present, but your risk is still relatively low. Your doctor might recommend lifestyle changes and closer monitoring of your heart health risk factors.

Scores between 100 and 299 show moderate calcium buildup. This indicates a moderate risk of heart disease, and your doctor will likely recommend more aggressive prevention strategies. This might include starting cholesterol-lowering medications or intensifying lifestyle modifications.

Scores of 300 and above indicate extensive calcium buildup and a high risk of heart disease. People in this range often need comprehensive heart disease prevention treatment, including medications, lifestyle changes, and possibly additional heart tests.

Keep in mind that calcium scores should always be interpreted in the context of your age, sex, and other risk factors. Your doctor will consider all these factors together to give you the most accurate assessment of your heart disease risk.

How to fix your coronary calcium score?

While you can't reverse or remove calcium that's already built up in your arteries, you can take steps to slow down further calcium accumulation and reduce your overall heart disease risk. The key is focusing on preventing new plaque formation and stabilizing existing plaque.

Lifestyle changes form the foundation of managing coronary calcium buildup. Regular exercise, particularly aerobic activities like walking, swimming, or cycling, can help improve your overall cardiovascular health. Aim for at least 150 minutes of moderate-intensity exercise per week, as recommended by heart health guidelines.

Diet plays a crucial role in slowing plaque progression. Focus on a heart-healthy eating pattern rich in vegetables, fruits, whole grains, lean proteins, and healthy fats. Limit processed foods, excessive sodium, and added sugars. The Mediterranean diet pattern has shown particular benefits for heart health.

Your doctor might recommend medications to help manage your risk factors. Statins, which lower cholesterol, are often prescribed for people with elevated calcium scores. These medications can help prevent new plaque formation and may even help stabilize existing plaque.

Other medications might be needed depending on your specific situation. These could include blood pressure medications if you have hypertension, diabetes medications if you have diabetes, or aspirin for blood clot prevention in certain cases.

Managing stress and getting adequate sleep are also important factors. Chronic stress and poor sleep can contribute to inflammation and other processes that promote heart disease. Consider stress-reduction techniques like meditation, deep breathing exercises, or regular relaxation activities.

What is the best coronary calcium score?

The best coronary calcium score is zero, which means no calcium deposits were found in your coronary arteries. This indicates the lowest possible risk of heart disease and suggests your arteries are free from significant plaque buildup.

Having a zero calcium score is associated with excellent heart health outcomes. Studies show that people with zero calcium scores have a very low risk of heart attack or other cardiac events over the next 10-15 years, typically less than 1% per year.

However, it's important to understand that calcium scores should be interpreted relative to your age and other characteristics. Younger people are more likely to have zero or very low scores simply because they haven't had as much time to develop calcium buildup. As we age, some calcium accumulation becomes more common.

For people over 45-50 years old, maintaining a zero calcium score becomes increasingly valuable. It suggests that despite aging, your arteries have remained relatively healthy and free from significant atherosclerosis.

Even if your score isn't zero, lower scores are always better than higher ones. Any steps you take to prevent further calcium accumulation and manage your heart disease risk factors will benefit your long-term health.

What are the risk factors for high coronary calcium score?

Several factors can increase your likelihood of having a high coronary calcium score. Understanding these risk factors can help you and your doctor assess your individual situation and develop appropriate prevention strategies.

Age is one of the most significant risk factors, as calcium buildup typically increases over time. Men generally start developing calcium deposits earlier than women, but women's risk increases significantly after menopause when estrogen levels decline.

Here are the main risk factors that can contribute to higher calcium scores:

• High blood pressure (hypertension)
• High cholesterol levels, particularly LDL ("bad") cholesterol
• Diabetes or prediabetes
• Smoking or history of smoking
• Family history of heart disease
• Obesity, especially abdominal obesity
• Sedentary lifestyle
• Chronic kidney disease
• Inflammatory conditions like rheumatoid arthritis
• Sleep apnea

Some less common but important risk factors include certain genetic conditions that affect cholesterol metabolism, such as familial hypercholesterolemia. Additionally, previous radiation therapy to the chest area can increase calcium buildup risk years later.

Lifestyle factors play a significant role in calcium accumulation. Diets high in processed foods, excessive sodium, and saturated fats can contribute to the development of atherosclerosis and subsequent calcium deposits. Chronic stress and poor sleep patterns may also contribute to the inflammatory processes that promote plaque formation.

Is it better to have high or low coronary calcium score?

It is definitely better to have a low coronary calcium score rather than a high one. Lower scores indicate less calcium buildup in your arteries, which translates to lower risk of heart attacks and other cardiovascular events.

A low calcium score suggests your arteries are healthier and have less atherosclerotic plaque. This means your risk of developing serious heart problems in the near future is lower, giving you more time to maintain your heart health through lifestyle choices and preventive care.

High calcium scores indicate more extensive plaque buildup and higher cardiovascular risk. While this might sound concerning, it's important to remember that knowing your score gives you valuable information. Even with a high score, you can take effective steps to reduce your risk and prevent heart problems.

People with higher calcium scores often benefit from more intensive medical management. This might include cholesterol-lowering medications, blood pressure control, and comprehensive lifestyle modifications. With proper treatment, many people with high calcium scores can significantly reduce their risk of future heart events.

The key is that any calcium score, whether high or low, provides useful information for you and your doctor. Low scores can be reassuring and motivate you to maintain healthy habits. High scores, while indicating higher risk, can guide important treatment decisions that ultimately protect your heart health.

What are the possible complications of low coronary calcium score?

Having a low coronary calcium score generally doesn't cause complications, but there are some important considerations to keep in mind. The main concern is that a low score might provide false reassurance, leading some people to neglect other important aspects of heart health.

A zero or low calcium score doesn't mean you're completely free from heart disease risk. You can still have soft plaque in your arteries that doesn't contain calcium yet. This type of plaque can sometimes be more dangerous because it's more likely to rupture and cause a heart attack.

Some people with low calcium scores might have other types of heart problems that the scan doesn't detect. For example, you could have heart rhythm problems, valve issues, or other conditions that affect heart function but don't involve calcium buildup in the coronary arteries.

Another consideration is that calcium scores can change over time. Even if your score is low now, it can increase as you age or if your risk factors worsen. This means you still need to maintain healthy lifestyle habits and manage conditions like high blood pressure, diabetes, and high cholesterol.

Rarely, people with genetic conditions affecting cholesterol metabolism might develop heart problems despite having low calcium scores. These conditions can cause rapid plaque formation that might not show up as calcium deposits on the scan.

What are the possible complications of high coronary calcium score?

A high coronary calcium score indicates significant plaque buildup in your coronary arteries, which can lead to several potential complications. The most serious concern is an increased risk of heart attack, as high calcium scores are associated with more extensive coronary artery disease.

People with high calcium scores have a greater likelihood of developing chest pain (angina) during physical activity or stress. This happens when the narrowed arteries can't supply enough blood to meet your heart's increased oxygen demands during exertion.

Here are the main complications associated with high coronary calcium scores:

• Increased risk of heart attack (myocardial infarction)
• Chest pain or discomfort (angina)
• Shortness of breath during activity
• Need for heart procedures like angioplasty or bypass surgery
• Development of heart failure over time
• Increased risk of stroke
• Higher likelihood of sudden cardiac death

The risk of these complications generally increases with higher calcium scores. People with scores above 300 have significantly higher risks than those with scores between 100-299, though individual risk varies based on age, sex, and other factors.

Some people with very high calcium scores might experience what's called "cardiac anxiety," where knowing about their condition causes significant worry or stress. While understandable, this anxiety can sometimes interfere with daily activities and quality of life.

In rare cases, extensive calcium buildup can make future heart procedures more challenging. Heavy calcification can complicate angioplasty procedures or make bypass surgery more difficult, though skilled cardiac specialists can usually manage these situations effectively.

When should I see a doctor for coronary calcium scan results?

You should discuss your coronary calcium scan results with your doctor regardless of the score, as they need to interpret the results in the context of your overall health and risk factors. This conversation is important for developing an appropriate prevention or treatment plan.

If you have a zero calcium score, you should still see your doctor to discuss maintaining your heart health. Even with excellent scan results, you'll need ongoing monitoring of your risk factors and guidance on keeping your score low as you age.

People with calcium scores between 1-99 should schedule a follow-up appointment to discuss lifestyle modifications and determine if any additional testing or treatment is needed. Your doctor will help you understand what this mild calcium buildup means for your long-term health.

Those with scores of 100 or higher should see their doctor promptly to discuss more intensive prevention strategies. Higher scores often require comprehensive management including medications, lifestyle changes, and possibly additional heart tests.

You should seek immediate medical attention if you develop any concerning symptoms after your scan, especially if you have a high calcium score. These symptoms include chest pain, shortness of breath, unusual fatigue, or any discomfort that might suggest heart problems.

Additionally, schedule regular follow-up appointments as recommended by your doctor. People with higher calcium scores typically need more frequent monitoring and may benefit from repeat scans every few years to track changes in their calcium buildup.