A heart screening is a set of tests designed to detect signs of cardiovascular disease before symptoms appear. It can be as simple as a blood draw to check cholesterol levels or as detailed as imaging that maps calcium buildup inside your arteries. The goal is to catch problems early, when lifestyle changes or treatment can prevent a heart attack or stroke.
What a Heart Screening Typically Includes
There’s no single test called “a heart screening.” The term covers a range of checks, and what you receive depends on your age, risk factors, and what your doctor is looking for. Most screenings start with the basics and escalate only if something looks off.
The most common starting point is a blood test that measures your cholesterol and triglyceride levels. Healthy targets include total cholesterol below 200 mg/dL, LDL (“bad”) cholesterol below 130 mg/dL, and triglycerides below 150 mg/dL. For HDL (“good”) cholesterol, men should aim above 40 mg/dL and women above 50 mg/dL. Some screenings also measure C-reactive protein, a marker of inflammation. A level above 2.0 mg/L signals higher cardiovascular risk.
Beyond bloodwork, common screening tools include:
- Electrocardiogram (ECG or EKG): Records your heart’s electrical activity through sensors placed on your skin. It reveals irregular rhythms, abnormal heart rates, and signs of a previous heart attack. It does not show the heart’s physical structure.
- Echocardiogram: Uses sound waves to create a live image of your heart. It shows chamber size, wall movement, valve function, and whether fluid is collecting around the heart.
- Stress test: Measures how well your heart performs during physical exertion, usually on a treadmill or stationary bike.
- Coronary calcium scan: A CT scan that measures calcium deposits in the walls of your coronary arteries, a direct indicator of plaque buildup.
An ECG and an echocardiogram answer fundamentally different questions. The ECG tells your doctor how the heart’s electrical system is functioning right now. The echocardiogram shows how the heart is built and how effectively it pumps blood. Many screening packages include both because the information they provide doesn’t overlap.
What Coronary Calcium Scores Mean
If your screening includes a coronary calcium scan, you’ll receive a numerical score. A score of zero means no calcium was detected, suggesting a low chance of heart attack in coming years. A score between 100 and 300 indicates moderate plaque deposits and a relatively high risk of a heart attack or other cardiac event within the next three to five years. Anything above 300 signals more extensive disease and higher risk.
Your result may also be expressed as a percentile comparing you to others of the same age and sex. A calcium score at or above the 75th percentile has been linked with significantly higher heart attack risk, even if the raw number seems modest.
Who Should Get Screened
Current guidelines from the American College of Cardiology and American Heart Association recommend that adults aged 30 to 79 without known heart disease have their 10-year cardiovascular risk estimated. This calculation factors in your age, sex, cholesterol levels, blood pressure, smoking status, and whether you have diabetes.
For people at low risk (less than a 10 percent chance of a cardiac event in the next decade), routine screening with ECGs or calcium scans is generally not recommended, because the results rarely change treatment. For those at higher risk, the evidence is less clear-cut, and doctors weigh individual factors.
Certain situations push screening higher on the priority list regardless of your calculated risk score: a family history of early heart disease (a heart attack in a male relative before age 50 or a female relative before 60), occupations like commercial piloting where sudden incapacitation could endanger others, or cases where a screening result would lead to more aggressive management of conditions like high blood pressure or diabetes. The 2026 AHA guidelines also recommend a one-time measurement of lipoprotein(a), a genetically determined blood fat, to identify people who may need earlier or more intensive cholesterol-lowering treatment.
How to Prepare
Preparation depends entirely on which tests you’re having. A basic blood draw for cholesterol typically requires fasting for 9 to 12 hours beforehand. An ECG or echocardiogram usually needs no preparation at all.
More advanced cardiac imaging can require stricter prep. For certain nuclear heart scans, you may need to follow a low-carbohydrate, no-sugar diet starting 48 hours before the appointment, then consume only plain water for the final 18 to 24 hours. Staying well hydrated with water is important. If you have diabetes, you may be asked to skip diabetic medications after midnight the evening before. Wear comfortable clothing without metal snaps, zippers, or underwire bras, since these can interfere with imaging equipment.
Your doctor’s office will provide specific instructions based on the tests ordered. If you’re only going in for a standard cholesterol screening, the prep is minimal.
What Happens If Results Are Abnormal
An abnormal result on a screening test doesn’t automatically mean you have heart disease. It means further investigation is warranted. The next step depends on what the initial test showed.
If you fail a stress test and have risk factors for cardiovascular disease, the typical follow-up is a coronary angiogram (also called cardiac catheterization). During this procedure, contrast dye is injected into your coronary arteries and X-ray images reveal any narrowing. Doctors look for blockages of 70 percent or more, the threshold at which treatment is usually recommended. If significant narrowing is found, your care team will discuss options that can range from dietary and exercise changes to cardiac rehabilitation, medication, stents, or surgery, depending on severity.
If bloodwork shows elevated cholesterol or triglycerides but imaging looks normal, the path forward is often lifestyle modification: changes to diet, increased physical activity, and sometimes cholesterol-lowering medication.
Cost and Insurance Coverage
Medicare Part B covers a cardiovascular screening blood test once every five years, including cholesterol, lipid, and triglyceride levels. If your provider accepts Medicare’s standard payment terms, you pay nothing out of pocket for this test. Most private insurance plans cover similar preventive blood panels at no cost under the Affordable Care Act’s preventive care provisions.
Advanced imaging like calcium scans, echocardiograms, and stress tests are a different story. These are more often covered when a doctor orders them based on symptoms or elevated risk, not as routine screening. Out-of-pocket costs vary widely depending on your insurance, the facility, and the specific test. If your doctor recommends a test beyond the standard covered screening, ask in advance what your plan will pay for and what you’ll owe.