In short
Heart testing names get thrown around quickly in appointments, and each one answers a genuinely different question about how the heart is doing.
On your report
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01
ECG: The Heart's Electrical Snapshot
An electrocardiogram, usually called an ECG or EKG, records the electrical signal that triggers each heartbeat using small sensors placed on the skin. It takes just a few minutes and shows heart rate, rhythm, and certain patterns that can suggest a past or ongoing heart attack, an enlarged heart, or an electrical conduction problem.
What it does not show directly is how well the heart muscle is pumping or whether the arteries feeding it are narrowed. A normal ECG at one moment does not rule out heart disease, especially if it's captured between episodes of symptoms, which is why it is usually one piece of a larger evaluation rather than the whole answer.
02
Echocardiogram: Watching the Heart Move
An echocardiogram uses ultrasound to create a moving picture of the heart in real time. It shows the size of each chamber, how well the heart squeezes with each beat (often summarized as an ejection fraction), and whether the valves are opening and closing properly. It's painless and uses no radiation.
This test answers questions an ECG cannot, particularly about pumping strength and valve function, but it does not directly show narrowed coronary arteries unless the reduced blood flow has already affected how a section of muscle moves. It's often ordered when someone has breathlessness, swelling, or a known or suspected valve issue.
03
Stress Testing: The Heart Under Demand
A stress test evaluates how the heart performs when it's working harder, either through exercise on a treadmill or a medication that mimics exercise's effect for people who can't walk on one. Combined with an ECG or imaging, it can reveal blood flow problems that only show up when the heart's demand for oxygen rises, even if things look fine at rest.
This is useful precisely because many blockages don't cause obvious problems while sitting still. A stress test can come back abnormal, normal, or inconclusive, and the result is usually interpreted alongside symptoms and other findings rather than as a stand-alone yes-or-no answer.
04
Coronary Calcium Score: A Look at Buildup Over Time
A coronary calcium scan is a quick CT scan that measures calcium deposits in the wall of the heart's arteries, which reflect longer-term plaque buildup rather than a snapshot of function. The result is reported as a score, with zero suggesting a low likelihood of significant plaque and higher scores suggesting more extensive buildup.
It's typically used in people without known heart disease to help refine risk when the picture from cholesterol, blood pressure, and other factors is unclear, helping decide how aggressively to manage those risks. It's not usually repeated frequently, since it reflects accumulated buildup rather than something that changes week to week.
Values mentioned in this story
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Sources
- Heart Diseasesmedlineplus.gov
- Diagnostic Imagingmedlineplus.gov
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