Before You Schedule a Calcium Scan, Ask This
Before scheduling a calcium scan, ask what you and your clinician would do differently with the result.
Dear reader,
Some results do not give you an answer. They leave you with a decision.
Your cholesterol is a little high. You are thinking about your family’s heart history. Perhaps you also had high blood pressure or diabetes during pregnancy, or went through menopause early. Should you start cholesterol medicine? Would another test help you decide?
That is often when a woman hears about a coronary artery calcium scan.
What would we do differently with the result?
The short answer
Sometimes. Not every woman needs one.
A coronary artery calcium scan, also called a CAC scan, uses X-rays to look for calcium in plaque in the arteries that supply your heart. Plaque is a buildup of cholesterol, fat and other substances in artery walls.
It can sometimes help you and your clinician decide whether to start cholesterol medicine. Current guidance includes certain women age 45 or older who have no known disease in the heart’s arteries. Your clinician first reviews your history and estimates your chance of a heart attack or stroke over the next ten years. If the decision about medicine is still unclear, a scan may help. Turning 45 alone is not a reason to have one.
The scan is not an emergency test. New chest pressure, severe trouble breathing or fainting needs urgent medical help, even if an earlier score was zero. Call 911 or your local emergency number.
Read the full calcium-scan guideThe heart explanation
One test answers one part of the question.
Your age, cholesterol, blood pressure, diabetes and smoking history help your clinician estimate your chance of a future heart attack or stroke.
A calcium scan looks for a specific kind of plaque. It does not show how well your heart pumps or how much activity you can comfortably do.
The score is one part of your heart story.
What the score can show
It finds plaque that contains calcium.
The scan usually does not need an injection of dye. It uses a low dose of radiation. The score describes how much calcium it finds in plaque.
A score of zero means no plaque containing calcium was seen. That can be reassuring for someone without symptoms. But it does not mean zero heart risk. The scan can miss plaque that has not developed calcium.
A score above zero means the scan found some calcium in plaque. Higher scores mean it found more. The score is not a percentage of blockage: a score of 100 does not mean an artery is 100% blocked.
The result cannot explain every symptom or decide treatment by itself. New or changing symptoms need their own evaluation.
Ask about the downsides, too. Besides radiation, a scan can find something unexpected that leads to more tests or appointments. Tell your healthcare team if you are pregnant or could be pregnant, and check the cost before scheduling.
When the scan may help
The result should help you make a decision.
A calcium scan may help when:
- Your clinician has reviewed your test results and health history.
- You are still unsure whether to start cholesterol medicine.
- Different results would lead to different next steps.
It may add little if your treatment plan is already clear, your chance of a heart attack or stroke is very low, or you already have disease in the heart’s arteries. Symptoms may call for a different kind of test.
Read the full guide
What the score means—and what zero cannot rule out.
The HEART RESERVE guide explains the score ranges, what the scan can miss, and when it may help you decide about cholesterol medicine.
From Lisa
There is no prize for collecting the most tests.
A useful test answers a question that matters to your care. Before you schedule it, understand what it can tell you and what you would do next.
The right test, asked for the right reason, can turn uncertainty into a more useful conversation.
With care,
Lisa Zahakos, RPA-CFounder, HEART RESERVEPut the question into your full story
Bring the rest of your heart story, too.
The private HEART RESERVE Heart Story helps you organize what you already know before your next appointment. Nothing is scored, diagnosed, submitted, or stored.
Build my Heart StoryEvidence behind this Letter
Sources and review
Sources last checked: September 7, 2026
- Cardiovascular Disease: Risk Assessment With Nontraditional Risk FactorsU.S. Preventive Services Task Force · Benefits and Harms · 2018
- 2026 Guideline on the Management of DyslipidemiaACC/AHA Multisociety Guideline · Circulation · 2026
- Coronary Artery Calcium TestAmerican Heart Association · 2026
- Ten-Year Association of Coronary Artery Calcium With ASCVD Events: MESAEuropean Heart Journal · 2018
- NLA Scientific Statement on CAC Scoring for ASCVD PreventionAmerican College of Cardiology · 2020
- 2021 Guideline for the Evaluation and Diagnosis of Chest PainAHA/ACC Multisociety Guideline · Circulation · 2021
Independent clinical review is identified only when completed and approved in writing. No external reviewer or organization is implied. Sources do not imply endorsement of HEART RESERVE.