A TTE test, or transthoracic echocardiogram, is an ultrasound of your heart. A technician places a handheld probe on your chest, and sound waves bounce off your heart structures to create a real-time moving image on a screen. It’s one of the most commonly performed cardiac tests, used to check how well your heart pumps, how your valves are working, and whether your heart chambers are a normal size.
What a TTE Can Show
The primary reason doctors order a TTE is to measure how effectively your left ventricle (the heart’s main pumping chamber) is working. The key number here is your ejection fraction: the percentage of blood your heart pushes out with each beat. A normal ejection fraction is roughly 52 to 72 percent for men and 54 to 74 percent for women. Below 40 percent is considered moderately abnormal, and below 30 percent is severely reduced.
Beyond pumping strength, the test measures the size and shape of all four heart chambers, checks each heart valve for leaks or narrowing, estimates blood pressure inside your heart, and tracks how quickly blood moves through. It can also spot fluid around the heart, blood clots, congenital heart defects, and problems with the aorta like aneurysms or tears.
Common Reasons Doctors Order One
You’ll typically be sent for a TTE if you have unexplained shortness of breath, chest pain, swelling in your legs, or a heart murmur your doctor wants to investigate. It’s the go-to test for evaluating suspected heart failure, and it helps determine how severe any valve problem is and whether you need medication, further testing, or surgery.
A TTE is also used to monitor known heart conditions over time, check on heart function after a heart attack or chemotherapy, evaluate irregular heart rhythms like atrial fibrillation, and investigate unexplained strokes in younger patients where a heart-related cause is suspected. If you have high blood pressure with signs of organ damage, a TTE can reveal whether the heart wall has thickened from working too hard.
How the Test Works
The probe on your chest contains a piezoelectric crystal, a material that vibrates when electricity passes through it, producing ultrasound waves at frequencies between 1.5 and 7.5 megahertz. Those sound waves travel through your chest wall and bounce off the walls, valves, and blood inside your heart. When the reflected waves return to the crystal, it converts them back into electrical signals. The machine calculates the distance to each structure based on how long the echo took to return and how intense it was, then assembles those signals into a detailed, moving image.
What to Expect During the Test
A standard TTE takes roughly 30 to 60 minutes. You’ll change into a hospital gown and lie on an exam table, usually on your left side, since that position brings the heart closer to the chest wall. The sonographer applies a warm gel to your chest to help the probe make good contact, then presses the transducer firmly against several spots on your chest, angling it to capture different views of your heart.
You may hear a whooshing sound, which is the Doppler feature measuring blood flow. The sonographer might ask you to hold your breath briefly or shift positions. Some people find the pressure of the probe slightly uncomfortable, but the test is painless. No needles, no sedation, no fasting required. You can eat, drink, and take your medications normally beforehand, and you can drive yourself home and resume your usual activities immediately after.
Safety Profile
A TTE uses sound waves, not radiation. There are no known risks or side effects from the ultrasound itself, which makes it safe to repeat as often as needed, including during pregnancy. The only consideration worth mentioning: if you have a pacemaker or other implanted cardiac device, let your care team know ahead of time so they can account for it in the images.
When Image Quality Falls Short
The biggest limitation of a TTE is that the sound waves have to pass through skin, fat, muscle, and ribs before reaching your heart, and certain body types make that harder. Obesity is the most significant factor. One large study found that about 21 percent of TTEs in people with a BMI of 30 or higher were non-diagnostic, compared to roughly 8 percent in people with lower BMIs. Older age, higher heart rate, and being an inpatient also reduce image quality.
When standard images aren’t clear enough, technicians can try lower-frequency probes, reposition you, or use a contrast agent (a substance injected into a vein that makes blood flow easier to see on ultrasound). Lung conditions like emphysema can also interfere, because air-filled lungs scatter the ultrasound waves before they reach the heart.
How a TTE Differs From a TEE
A TEE, or transesophageal echocardiogram, captures images from inside your esophagus rather than through the chest wall. Because the esophagus sits directly behind the heart, the probe is much closer to the structures being imaged, which produces sharper, more detailed pictures, especially of the back of the heart and the heart valves.
The tradeoff is that a TEE is more invasive. You swallow a flexible tube with an ultrasound probe on the end, and you’re typically given a sedative and a throat-numbing spray. You need to fast beforehand, and you can’t drive yourself home afterward. Doctors almost always try a TTE first and only move to a TEE if the images aren’t clear enough, if they need to look for blood clots before a procedure like cardioversion, or if you’re in a life-threatening emergency where speed and image quality are critical.