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Doctors Still Using Heart Tests With 500% More Radiation?!

Most people assume heart scans are routine… harmless… almost like getting an X-ray at the dentist.

But a growing body of research shows something deeply unsettling:

Not all heart scans are created equal.

In fact, depending on the test and where it’s performed you could be exposed to up to 500% more radiation than necessary.

And most patients have no idea it’s happening.

Before you agree to your next “routine” cardiac scan, here’s what you need to know.

According to reporting published a few weeks ago in Journal of the American Medical Association, researchers analyzing cardiac imaging practices around the world found huge differences in radiation exposure from commonly used heart tests.

Some facilities used modern protocols that minimize radiation.

Others? Not so much.

The difference between the lowest-dose and highest-dose scans was staggering—sometimes five times higher.

That’s a serious issue, because radiation exposure adds up over time.

As experts at Harvard warn, cardiac imaging tests that rely on CT technology can deliver radiation doses high enough to raise long-term cancer risk if used repeatedly.

And here’s the problem:

Many patients are being steered toward more aggressive imaging tests even when simpler, safer options exist.

One of the biggest offenders is CT coronary angiography.

This test creates detailed images of the heart’s arteries—but it can expose patients to 14 millisieverts (mSv) of radiation, depending on the protocol.

To put that into perspective, that’s roughly the equivalent of hundreds of chest X-rays.

Meanwhile, there’s a much simpler – and safer – heart test that many patients are never told about.

It’s the Coronary Artery Calcium scan, often called a CAC scan.

This quick scan measures calcified plaque buildup inside your coronary arteries—a key predictor of future heart attacks.

And the radiation exposure?

Typically around 1 mSv or less.

In other words, a CAC scan can expose you to a fraction of the radiation while still delivering powerful insight into your heart risk.

In fact, research shows that CAC scoring is one of the best early predictors of heart disease, especially for people who appear healthy but may have hidden plaque building up silently.

So why aren’t more patients offered this lower-dose option first?

Partly because more complex imaging—like angiography—has become routine in many settings.

But “routine” doesn’t always mean necessary.

And when radiation is involved, every extra dose matters.

The takeaway here is simple:

If your doctor recommends a cardiac scan, don’t be afraid to ask a few key questions:

  • What type of scan is this?
  • How much radiation does it involve?
  • Could a CAC scan provide the information we need instead?

Because when it comes to medical radiation, more testing isn’t always better testing.

Sometimes the smartest move is choosing the test that reveals the most about your heart…

While exposing your body to the least risk possible.

Your heart—and your long-term health—deserve nothing less.

Ray Thatcher
Research Director, Health Sciences Institute

Sources:

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Allan Spreen, M.D.
Dr. Allan Spreen, Chief Medical Advisor

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