What Is a Calcium Score CT Scan and Should You Get One?

Cardiovascular disease remains one of the leading causes of death in Australia, often progressing silently before symptoms appear. A Calcium Score CT Scan—also known as a Coronary Artery Calcium (CAC) scan—is a powerful diagnostic tool designed to detect early signs of coronary artery disease (CAD). It is a quick, non-invasive heart scan that evaluates the presence of calcium deposits in the coronary arteries, offering valuable insights into your risk for future cardiac events such as heart attacks.

But how does it work, and is it something you should consider? This article explores the technology, benefits, risk categories, and ideal candidates for this heart health test.

How Does a Calcium Score CT Scan Work?

A Calcium Score CT Scan is performed using a cardiac CT scanner without the need for contrast dye or injections. The scan captures high-resolution images of the heart to detect calcified plaque in the coronary arteries. These calcium deposits, which can narrow the arteries, are early indicators of atherosclerosis—a major contributor to heart disease.

The scan is painless and takes about 10 to 15 minutes. Patients lie flat on a table, and electrodes are placed on the chest to synchronise imaging with the heartbeat. You may be asked to hold your breath briefly while the scanner captures the necessary images.

Why Is This Test Considered Non-Invasive and Safe?

Several attributes make the Calcium Score CT Scan especially appealing:

• Non-invasive: No needles, dyes, or surgical tools involved
• Quick procedure: Takes less than 20 minutes
• Minimal radiation exposure
• No preparation needed in most cases
• Performed on an outpatient basis
• No recovery time required

These features allow patients to have the scan performed easily and comfortably, without needing time off work or extensive planning.

What Can a Calcium Score Tell You?

The scan provides an Agatston score, which quantifies the extent of calcium in the arteries. This score helps determine the likelihood of future cardiac events.

Calcium Score Interpretation

Calcium Score (Agatston Score)	Risk Level	Interpretation
0	Low	No visible plaque; very low risk of heart attack
1–99	Mild	Some plaque; low to moderate risk
100–399	Moderate	Plaque present; moderate risk – consider intervention
400+	High	Extensive plaque; high risk – further assessment needed

A score of zero suggests a low risk of coronary artery disease in the near term, while higher scores reflect increasing risk and may prompt lifestyle changes, further testing, or medical treatment.

Who Should Consider Getting a Calcium Score CT Scan?

This scan is not for everyone but is highly recommended for those in the intermediate-risk group for cardiovascular disease. These are people who may not show symptoms but have certain risk factors.

Ideal Candidates:

• Adults aged 40–70 with moderate cardiovascular risk
• Those with a family history of coronary artery disease
• Current or former smokers
• Patients with high blood pressure
• People with type 2 diabetes
• Individuals with elevated cholesterol
• Those with abnormal results from previous blood tests

Who Might Benefit vs Who May Not

Likely to Benefit	May Not Benefit
Adults with moderate risk of cardiovascular disease	People with known heart disease
Patients with uncertain risk after blood tests	Low-risk young adults with no symptoms
Individuals with family history of coronary disease	Pregnant women (due to radiation)
Smokers or diabetics without symptoms	Those recently scanned or undergoing other tests

What Happens During the Procedure?

A Calcium Score CT Scan is remarkably straightforward. Here’s what to expect:

• No special diet or fasting required (though you may need to avoid caffeine)
• You’ll lie flat on the CT table
• Electrodes are attached to monitor your heart rate
• The table slides into the scanner for imaging
• You may be asked to hold your breath briefly
• The procedure typically takes under 15 minutes

After the scan, your images will be analysed by a radiologist, and a report including your calcium score will be provided to your referring healthcare provider.

What Are the Advantages of Getting This Scan?

There are numerous clinical advantages to having a Calcium Score CT Scan, especially when determining your future cardiac risk:

• Early Detection: Identifies coronary artery disease before symptoms occur
• Better Prevention: Helps guide lifestyle or medical intervention
• Risk Stratification: Distinguishes between low, moderate, and high-risk individuals
• Avoid Over-treatment: Rules out heart disease in some borderline cases
• Objective Results: Provides a quantifiable score for tracking changes over time

These benefits can be life-changing—empowering patients and doctors to take proactive steps long before a heart attack becomes a reality.

Should You Rely Solely on a Calcium Score?

While powerful, a calcium score should not be the only method used to assess heart health. It complements other evaluations such as:

• Blood pressure readings
• Cholesterol levels
• Family history and personal lifestyle habits
• Stress tests and echocardiograms if necessary

In short, a Calcium Score CT Scan provides one crucial piece of the puzzle—especially useful in clarifying cardiovascular risk when traditional tests return borderline results.

Why Choose Border Radiology Specialists for Your Heart Health Imaging?

At Border Radiology Specialists, we offer state-of-the-art cardiac CT imaging services, including Calcium Score CT Scans, performed in a professional, comfortable, and patient-focused environment. Our skilled team of radiologists and technicians ensures every scan is precise, efficient, and interpreted with clinical accuracy. Our facilities are equipped to deliver timely results that support informed healthcare decisions. We pride ourselves on helping our community take charge of their cardiovascular health with confidence and clarity.

References

• Heart Foundation Australia. (2023). “Understanding Heart Health Checks.”
  https://www.heartfoundation.org.au/conditions/heart-health-checks
• Royal Australian and New Zealand College of Radiologists (RANZCR). “CT Coronary Artery Calcium Scoring.”
  https://www.ranzcr.com
• Healthdirect Australia. (2024). “Heart Tests.”
  https://www.healthdirect.gov.au/heart-tests

Frequently Asked Questions (FAQs)

1. Is a Calcium Score CT Scan safe?
   Yes. The scan is non-invasive, quick, and uses low levels of radiation. It does not involve injections or contrast dye.
2. Will the scan show all types of heart disease?
   No. It specifically detects calcified plaque in the coronary arteries. It does not evaluate soft plaque or assess heart valve function.
3. How often should you get a calcium score test?
   This depends on your age, risk factors, and initial result. Your doctor may recommend follow-up imaging every 3–5 years if necessary.
4. Do you need a referral for a calcium score scan?
   In most cases, yes. You should consult your GP or specialist to determine if the scan is appropriate for your situation.
5. Can lifestyle changes lower a high calcium score?
   While the score itself won’t decrease, lifestyle changes can help slow further plaque build-up and reduce your overall risk.
6. Is a calcium score scan recommended if I already have heart disease?
   Usually not. If you’ve already been diagnosed with coronary artery disease, other imaging and tests will offer more detailed insights.