cholesterol CT scan preparation

Overview

A cholesterol CT scan (also called a coronary calcium scan) is a special X-ray that looks for calcium deposits in the walls of your heart arteries. These deposits are a sign of plaque, which can narrow or block arteries and increase your risk of a heart attack.

Not everyone needs this scan. It is most often used for people who have a medium risk of heart disease and need more information to decide on treatment.

It is typically recommended for adults (age 40–75) who have risk factors like high cholesterol, high blood pressure, smoking, diabetes, or a family history of early heart disease, but who do not yet have clear symptoms of heart trouble.

Symptoms

Common symptoms

• High cholesterol itself usually does not cause symptoms. That is why testing is important.

Symptoms in children

• Children rarely need a cholesterol CT scan. If they have very high inherited cholesterol, a doctor may consider it in special cases.

Symptoms in older adults

• Older adults may have more build‑up of plaque, so the scan can help assess their heart disease risk.

Causes

Main causes

• High levels of LDL (''bad'') cholesterol in your blood can lead to plaque buildup in arteries.
• Inflammation in the artery walls also contributes to calcium deposits.

Risk factors

• Unhealthy diet (high in saturated and trans fats)
• Lack of physical activity
• Smoking and excessive alcohol use
• High blood pressure and diabetes
• Being overweight or obese
• Family history of early heart disease

When to see a doctor

See a doctor urgently if:

• If you have sudden chest pain, trouble breathing, or symptoms of a heart attack – call your local emergency number right away.

Book a routine appointment if:

• If you are between 40 and 75 years old and have risk factors for heart disease, talk to your doctor about whether a cholesterol CT scan might help guide your care.

Diagnosis

A cholesterol CT scan measures the amount of calcium in your coronary arteries. The result is called a coronary artery calcium (CAC) score. This number helps your doctor estimate your risk of future heart problems.

Tests that may be done

• Coronary calcium scan (the test itself)
• Blood tests to check your cholesterol levels (often done before or after the scan)

What to expect at your appointment

You will be asked to remove any metal objects such as jewellery or glasses and change into a hospital gown. You will lie on a table that slides into the CT scanner. The technician may ask you to hold your breath for a few seconds while the images are taken. You can return to normal activities immediately after.

Treatment

The results of the scan help decide if you need treatment to lower your heart disease risk. Treatment focuses on managing cholesterol and other risk factors.

Self-care at home

• Eat a heart‑healthy diet with plenty of fruits, vegetables, whole grains, and lean protein.
• Get at least 30 minutes of moderate exercise most days.
• Quit smoking and limit alcohol.
• Maintain a healthy weight.

Medical treatments

If your calcium score is high, your doctor may recommend medications to lower your cholesterol (such as statins) and control blood pressure. They will work with you to find the right plan – always follow your doctor’s advice and never change or stop medicines without talking to them first.

When is surgery considered?

Surgery is not a direct treatment for the calcium score itself. However, if the scan shows severe blockages, your doctor may refer you for further tests or procedures, such as an angiogram or stent placement. That will be discussed with you step by step.

Living with this condition

After the scan, most people continue with their usual activities. If your calcium score is high, you may need to make changes to lower your risk, like improving your diet and staying active.

Lifestyle tips

• Follow a heart‑healthy eating plan (like the Mediterranean diet).
• Walk, swim, or cycle regularly.
• Manage stress through relaxation techniques or hobbies.
• Get enough sleep (7–9 hours per night).

Diet and exercise

A diet low in saturated fat, trans fat, and salt, and high in fibre, can help lower cholesterol. Regular aerobic exercise (brisk walking, jogging, cycling) for at least 150 minutes per week is recommended. Always check with your doctor before starting a new exercise programme.

Mental health and emotional wellbeing

Learning that you have a higher risk of heart disease can be worrying. It is normal to feel anxious or stressed. Talk to your doctor or a counsellor if these feelings are affecting your daily life. Remember, many people can reduce their risk with the right steps.

Prevention

You cannot always prevent plaque buildup, but you can lower your chances by controlling cholesterol, blood pressure, blood sugar, and by not smoking. The scan itself does not prevent heart disease – it is a tool to guide prevention efforts.

Vaccines

There are no vaccines for high cholesterol or calcium buildup. However, staying up‑to‑date with flu and pneumonia vaccines can help prevent infections that might stress your heart.

Screening programmes

A cholesterol CT scan is itself a screening test. Regular check‑ups with blood tests for cholesterol are standard. Ask your doctor when you should be screened based on your age and risk factors.

Complications

If left untreated

• High cholesterol that is not managed can lead to gradual plaque buildup in arteries.
• Over time, this can cause narrowing or blockages that may lead to a heart attack or stroke.

Long-term outlook

The good news is that many people can lower their heart disease risk significantly with healthy habits and, if needed, medication. A higher calcium score does not mean you will definitely have a heart attack – it is a signal to take action. With the right steps, you can protect your heart and live a full life.

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