Coronary artery calcium scoring

Coronary artery calcium scoring is a test which helps diagnose heart disease. It is also called calcium scoring or CACS. The test uses a high-powered scanner to show any build-up of calcium in the heart’s blood vessels (coronary arteries).

Your doctor may suggest this test to help assess your risk of heart disease, even if you don’t have symptoms.

It is a simple test which doesn’t require x-ray dye. You may receive medication to slow your heart rate down during the procedure, as the test works better when your heart rate is below 60 beats per minute.

In New Zealand, this test is mainly carried out in private practice. Check beforehand if you’ll need to pay for the procedure. If you have health insurance, ask your insurer if you’re covered before attending the appointment.

Before your appointment

Tell the person doing the test if you’re pregnant.

The quality of the scan is best if your heart rate is low. So avoid caffeinated drinks (coffee, tea, energy drinks), nicotine (including vapes) and alcohol for at least 4 hours before the test . Allow plenty of time to get to your appointment, so you don’t have to rush.

What happens?

The test will be carried out in a clinic.

You’ll be asked to remove clothing from above the waist, and you’ll be given a gown.

Then you’ll be asked to lie on your back on the table of the CT scanner. ECG electrodes (sticky pads) will be placed on your chest and shoulders. You may be given medication to slow your heart rate down.

You’ll be asked to hold your breath for a few seconds while the image is taken when the scanner passes over your chest region. Your head stays outside the scanner.

Expect to be at the clinic for about an hour.

After the test

After the test you’ll be free to return to your normal daily activities. You won’t get the results from the test on the day. The information will be sent to the doctor who ordered the test.

Key things to remember