Is the heart CT (calcium scoring) harmful? Does it involve radiation?

It uses X-rays, but only at a very small dose: about 0.5–1 mSv. A standard chest CT gives roughly 5 to 10 times more. There's no contrast agent, so no injection either.

Like any X-ray scan, it carries a very small risk. That's why one of our doctors goes through your health history in a short pre-consultation to check the scan makes sense for you. If you're pregnant or might be, just let us know before booking.