An echocardiogram is an ultrasound of your heart. It uses sound waves to create real-time, moving images of your heart’s chambers, valves, walls, and blood vessels, letting doctors see how well your heart is pumping and whether any structures are damaged. The standard version is completely noninvasive, requires no radiation, and typically takes 40 to 60 minutes.
How the Test Creates Images
The technology behind an echocardiogram is the same basic principle used in pregnancy ultrasounds. A handheld device called a transducer sends sound waves into your chest at a known frequency. When those waves hit different structures inside your heart, they bounce back at slightly different speeds and strengths depending on the density of the tissue. The machine measures how long each echo takes to return and how much its frequency has changed, then uses that information to map out exactly where each structure sits and how dense it is.
Blood and soft tissue transmit sound at roughly the same speed (about 1,540 meters per second), while bone transmits it much faster and air much slower. The machine assigns brightness based on how strongly each echo returns, building a detailed, moving picture of your heart in real time. This is why gel is applied to your chest before the test: it eliminates the air gap between the transducer and your skin, which would otherwise block the sound waves.
What an Echocardiogram Can Detect
Doctors order echocardiograms to evaluate a wide range of heart problems. The images reveal how strongly your heart muscle contracts, whether your valves open and close properly, and whether any chambers are enlarged or thickened. Two of the most common findings are valve regurgitation, where a valve doesn’t close completely and allows blood to leak backward, and valve stenosis, where a valve doesn’t open wide enough, forcing the heart to work harder to push blood through.
The test also detects cardiomyopathy (disease of the heart muscle itself), congenital heart defects, fluid around the heart, blood clots, and abnormal wall motion that can signal a previous heart attack or ongoing damage from poor blood flow. It’s one of the most versatile cardiac tests available because it shows both structure and function in a single exam.
Ejection Fraction: The Key Number
One of the most important measurements from an echocardiogram is your ejection fraction, the percentage of blood your left ventricle pumps out with each beat. A normal ejection fraction falls between 50% and 70%, though the precise normal range differs slightly by sex: 52% to 72% for men and 54% to 74% for women.
An ejection fraction of 41% to 51% in men (or 41% to 53% in women) is considered mildly abnormal. Between 30% and 40% is moderately abnormal. Below 30% is severely reduced and classified as heart failure with reduced ejection fraction. On the other end, readings above 75% are rare and can sometimes indicate a separate condition. This single number gives your doctor a quick snapshot of how efficiently your heart is working and often guides treatment decisions.
Types of Echocardiograms
Transthoracic (TTE)
This is the standard version and by far the most common. It’s entirely external. You lie on an exam table, a technician applies gel to your chest, and they move the transducer across different positions to capture views of your heart from multiple angles. There are no needles, no sedation, and no recovery time. You can drive yourself home and resume normal activities immediately.
Transesophageal (TEE)
When standard images aren’t clear enough, doctors may use a transesophageal echocardiogram instead. This involves guiding a thin, flexible probe with a tiny transducer on its tip through your mouth and into your esophagus. Because your esophagus sits directly behind your heart, the sound waves don’t have to pass through skin, muscle, or bone, producing much sharper images. TEE is particularly useful when obesity or lung disease interferes with standard imaging, or when doctors need high-resolution views of specific structures like the heart valves. It takes up to 90 minutes and requires sedation, so you’ll need someone to drive you home afterward.
Stress Echocardiogram
A stress echo combines the imaging test with exercise. You’ll walk on a treadmill or pedal a stationary bike to raise your heart rate, and images are taken before and after (or during) exertion. This reveals problems that only appear when the heart is working hard, such as reduced blood flow to part of the heart muscle during exercise.
Fetal Echocardiogram
This specialized version evaluates a baby’s heart before birth. It’s recommended when certain risk factors are present: pre-gestational diabetes, autoimmune conditions, in vitro fertilization, maternal rubella infection, a first-degree family history of congenital heart disease, or when a routine prenatal ultrasound reveals abnormalities. The technique is the same as a standard echocardiogram, just performed on the mother’s abdomen and focused on the fetal heart.
What to Expect During the Test
For a standard transthoracic echo, preparation is minimal. You’ll change into a hospital gown and a technician will attach small sticky patches (electrodes) to your chest, and sometimes your legs, to monitor your heart rhythm throughout the test. You’ll lie on your left side on an exam table, and the technician will press the transducer against different spots on your chest. The pressure can feel firm but shouldn’t be painful.
You may be asked to hold your breath, stay very still, or shift positions at certain points so the technician can get clearer images. The whole process typically wraps up in 40 to 60 minutes. There’s no fasting required and no downtime.
For a TEE, preparation is different. You’ll need to fast beforehand. Before the probe is inserted, you’ll gargle with a numbing solution to reduce your gag reflex, and you’ll receive sedation through an IV. Possible side effects include a sore throat afterward, nausea from the sedation, and, very rarely, minor bleeding or a tear in the esophagus. Most people feel back to normal within a few hours, though you’ll want to plan for someone else to handle the driving that day.
Understanding Your Results
Your results will include your ejection fraction along with descriptions of each valve, the size and thickness of each chamber, and how your heart walls move during contractions. A few terms you might see on the report:
- Regurgitation means a valve isn’t closing completely, allowing blood to flow backward. It can range from trivial (extremely minor and common even in healthy hearts) to severe.
- Stenosis means a valve isn’t opening wide enough, restricting blood flow and forcing the heart to pump harder.
- Wall motion abnormality means part of the heart muscle isn’t contracting normally, which can indicate damage from a heart attack or reduced blood supply.
Mild findings on an echocardiogram are extremely common and often don’t require any treatment. Trace amounts of valve regurgitation, for example, show up in many healthy adults. Your doctor will interpret your results in the context of your symptoms, medical history, and other test results to determine whether any action is needed.
3D Echocardiography
Newer echocardiogram technology can produce three-dimensional images of the heart, offering more accurate measurements than traditional 2D imaging. Standard 2D images rely on geometric assumptions and can be limited by foreshortened views, where the angle doesn’t quite capture the full length of a chamber. 3D imaging overcomes these limitations by tracking the heart muscle’s movement in all directions simultaneously. Research from the American Heart Association has found that 3D measurements of heart function are more accurate predictors of outcomes in heart failure patients than either 2D measurements or ejection fraction alone. While not yet available everywhere, 3D echocardiography is becoming more common at larger medical centers.