Your doctor ordered a transthoracic echocardiogram (TTE) because they need a detailed, real-time look at your heart’s structure and function. It’s one of the most commonly ordered cardiac tests, and it can reveal problems with your heart valves, measure how well your heart pumps blood, detect fluid around the heart, and identify structural abnormalities. The specific reason depends on your symptoms and medical history, but the test itself is noninvasive, painless, and takes less than an hour.
Common Reasons Your Doctor Ordered One
A TTE is appropriate for a wide range of symptoms and clinical situations. If you’re experiencing unexplained shortness of breath, chest pain, dizziness, fainting, or swelling in your legs, your doctor may want to rule out a heart problem as the cause. A new heart murmur picked up during a routine exam is another common trigger, since the echo can show whether a valve is leaking or narrowed.
Beyond symptoms, there are several medical events that prompt a TTE. After an ischemic stroke, doctors often order one to look for blood clots inside the heart or structural defects that could have allowed a clot to travel to the brain. If you’ve been diagnosed with heart failure, the test establishes a baseline and tracks how well your heart responds to treatment over time. It’s also used before and after certain heart surgeries or procedures to guide planning and confirm results.
The American College of Cardiology has rated over 100 clinical scenarios on a scale of 1 to 9 for whether imaging like a TTE is warranted. Scores of 7 to 9 mean it’s clearly appropriate, 4 to 6 mean it may be appropriate depending on context, and 1 to 3 mean it’s rarely needed. If your doctor ordered one, it almost certainly falls into one of the higher-scoring categories based on your specific situation.
What the Test Actually Measures
A TTE provides several key pieces of information, and one of the most important is your ejection fraction. This is the percentage of blood your heart pumps out with each beat. A normal ejection fraction falls between 55% and 70%. A reading from 41% to 49% is considered mildly reduced, while anything under 40% typically indicates heart failure or cardiomyopathy. Interestingly, a number above 75% can also signal a problem, such as a condition where the heart muscle is abnormally thick. Your ejection fraction directly shapes treatment decisions, so getting an accurate number matters.
The test also evaluates your heart valves in detail. It can detect regurgitation (blood leaking backward through a valve) and stenosis (a valve that’s too narrow to open fully). When a valve is narrowed, pressure builds up on one side, and the echo measures that pressure difference, called the valve gradient, to determine how severe the narrowing is. It also calculates the actual opening size of the valve in square centimeters. Together, these measurements tell your doctor whether a valve problem is mild and worth monitoring or severe enough to require intervention.
Beyond valves and pumping strength, the echo shows the overall size and shape of your heart chambers, the thickness of the heart walls, blood flow patterns, and whether there’s fluid in the sac surrounding the heart. It can also detect tumors or other growths near the valves.
What to Expect During the Test
You’ll be asked to remove clothing from your upper body and change into a hospital gown. A technician (called a sonographer) will apply gel to a handheld ultrasound wand and press it against different areas of your chest. The gel helps the sound waves travel more effectively between the wand and your skin, producing clearer images. You may be asked to lie on your left side or hold your breath briefly at certain points to get better views of specific structures.
The whole process typically takes under an hour, and there’s no radiation involved. Unlike a blood draw or a stress test, you don’t need to fast beforehand or stop any medications. You can drive yourself home and resume normal activities immediately. Results are usually interpreted by a cardiologist, and your ordering doctor will review the findings with you, often within a few days.
When a Standard Echo Isn’t Enough
A TTE works well for most people, but it has limitations. The ultrasound waves have to pass through your chest wall, ribs, and lungs to reach the heart. In people with certain body types, lung conditions, or chest anatomy that makes imaging difficult, the pictures may not be clear enough for a confident diagnosis.
In those cases, your doctor may recommend a transesophageal echocardiogram (TEE), which involves passing a small ultrasound probe down your throat into your esophagus. Because the esophagus sits directly behind the heart, a TEE provides much sharper images of structures at the back of the heart. It’s especially useful for detecting small blood clots before procedures to treat irregular heart rhythms, evaluating problems with prosthetic heart valves, and diagnosing tears in the aorta during emergencies. Doctors typically try a standard TTE first and only move to a TEE if the initial images are insufficient or the clinical situation demands it.
Why Ejection Fraction Alone Doesn’t Tell the Whole Story
It’s worth knowing that a “normal” ejection fraction doesn’t automatically mean your heart is fine. You can still have heart failure even with an ejection fraction of 50% or higher. This form, called heart failure with preserved ejection fraction, occurs when the heart pumps a normal percentage of blood but the chambers have stiffened and don’t fill properly. The TTE can pick up clues to this condition by showing abnormal filling patterns, thickened walls, or elevated pressures, which is one reason the test measures so many different things rather than relying on a single number.
If your doctor orders repeat echocardiograms over time, it’s usually to track changes in your ejection fraction, valve function, or chamber size in response to treatment. A rising ejection fraction after starting heart failure medication, for example, is a concrete sign that therapy is working. A worsening number may prompt a change in approach. The test’s ability to provide repeatable, radiation-free snapshots of your heart makes it one of the most practical tools in cardiology for long-term monitoring.