A complete transthoracic echocardiogram (TTE) is an ultrasound of your heart performed from the outside of your chest. It produces a full set of images and measurements covering all four heart chambers, all four valves, blood flow patterns, and the major blood vessels near the heart. The word “complete” distinguishes it from a “limited” study, which only looks at one or two specific things. A complete TTE typically takes 30 to 60 minutes and requires no special preparation.
What “Complete” Actually Means
When your doctor orders a “complete” TTE, they’re asking for a comprehensive assessment of your heart’s structure and function. The report will include measurements of chamber sizes (indexed to your body size), wall thickness, how strongly your heart squeezes, how well it relaxes between beats, how your valves open and close, and how blood moves through each chamber. It also checks for fluid around the heart, blood clots, and other abnormalities.
A limited or focused study, by contrast, might only check one thing, like whether fluid has built up around the heart. Limited studies skip the detailed velocity measurements and volume calculations that make a complete exam so thorough. In head-to-head comparisons, limited exams missed findings like mild valve narrowing, valve prolapse, aortic widening, small masses inside the heart, and pleural effusions that a complete TTE caught. Regional wall motion problems, which can signal a past heart attack, were the most commonly missed finding on limited studies.
Why Doctors Order One
The most common reason is suspected heart failure: swelling in the legs, fluid in the lungs, or unexplained shortness of breath paired with an abnormal EKG or chest X-ray. A complete TTE can confirm or rule out heart failure and identify the cause.
Other common reasons include:
- New or unexplained heart murmur, to check whether a valve is leaking or narrowed
- High blood pressure, to see if the heart muscle has thickened in response
- After a heart attack, to measure how much pumping function was lost
- Suspected cardiomyopathy, based on family history, abnormal EKG, or a physical exam finding
- Persistent low blood pressure without a clear cause
- Neuromuscular conditions like muscular dystrophy that can affect the heart
What Happens During the Test
You don’t need to fast, stop medications, or do anything special beforehand. You can eat, drink, and take your usual medications. You’ll change into a hospital gown and lie on your left side on an exam table. A technician (sonographer) places a few small electrode stickers on your chest to monitor your heart rhythm during the test, then applies warm gel to your skin.
The sonographer presses a handheld probe against several spots on your chest. Sound waves travel through your skin, bounce off heart structures, and return to the probe. A computer converts those returning echoes into moving images on a screen. You may be asked to hold still, roll onto your back, take a deep breath, or breathe out and hold it so the sonographer can get clearer pictures from different angles.
The test is completely noninvasive. There’s no sedation, no needles, and no radiation. Once the images are captured, the gel is wiped off, the electrodes are removed, and you go home. You can drive yourself and resume all normal activities immediately.
The Three Types of Ultrasound Used
A complete TTE uses more than one ultrasound technique during the same session. Standard two-dimensional (2D) imaging produces the live, moving pictures of your heart’s chambers and walls. This is what lets the sonographer see the size and shape of each chamber, measure wall thickness, and spot structural problems like a thickened septum or a mass inside the heart.
Doppler ultrasound is layered on top to evaluate blood flow. Color flow Doppler paints moving blood in red or blue on the screen, making it easy to see jets of blood leaking backward through a valve or flowing through an abnormal opening. Spectral Doppler (both pulsed-wave and continuous-wave) measures the speed and direction of blood flow at specific points. From those velocity measurements, the system can calculate pressure differences across valves, estimate pressures inside the heart, and quantify how much blood is leaking if a valve isn’t closing properly.
Some labs also add three-dimensional imaging when a more precise volume measurement is needed. 3D echocardiography measures heart chamber size directly rather than estimating it from a flat image, which avoids the geometric assumptions that can make 2D measurements less accurate. Studies have found 3D measurements of heart size and pumping strength are both more accurate and more reproducible.
Key Measurements in the Report
Ejection Fraction
This is the single most recognized number from an echocardiogram. Ejection fraction (EF) is the percentage of blood your left ventricle pumps out with each beat. A normal EF is 55% or higher. Between 50% and 54% is considered borderline low. An EF of 36% to 49% is impaired, and 35% or below is severely impaired. This number plays a major role in treatment decisions for heart failure and determines eligibility for certain devices and therapies.
Chamber Sizes
The report lists the dimensions of each chamber, adjusted for your body size. For the left ventricle, normal internal diameter during relaxation ranges from about 37 to 56 mm in men and 35 to 51 mm in women. An enlarged left ventricle can signal long-standing valve disease or cardiomyopathy. The left atrium is measured by volume, with normal being less than 34 mL per square meter of body surface area. An enlarged left atrium often accompanies high filling pressures or chronic valve leaking. The right-sided chambers are also measured and can flag conditions like pulmonary hypertension.
Wall Thickness and Mass
The thickness of the heart’s muscular walls tells your doctor whether the heart has been working harder than normal, a condition called hypertrophy. The report notes whether wall thickness is normal or increased and whether any thickening is evenly distributed or concentrated in one area, like the upper septum. Left ventricular mass, indexed to body size, is normally 40 to 110 g/m² in men and 33 to 99 g/m² in women.
Diastolic Function
This part of the report evaluates how well your heart relaxes and fills between beats. It uses a measurement called e-prime (e’), which captures the speed of the heart wall’s early relaxation. Low e-prime values indicate stiff heart muscle. Another key ratio, called E/e-prime, estimates filling pressures inside the heart. Values above 14 suggest elevated pressures, which can cause shortness of breath even when the heart’s pumping strength looks normal. Diastolic dysfunction is graded from Grade 1 (mild, relaxation problem) through Grade 3 (severe, restrictive filling).
Wall Motion
The sonographer and reading physician watch each segment of the heart wall to see if it contracts normally. Segments that move weakly (hypokinetic), don’t move at all (akinetic), or bulge outward during contraction (dyskinetic) suggest damage from a heart attack or reduced blood supply. The location of these abnormalities helps identify which coronary artery may be affected.
How Valves Are Assessed
Each of the four heart valves is evaluated for two potential problems: stenosis (the valve doesn’t open fully) and regurgitation (the valve leaks backward). The severity of each is graded as mild, moderate, or severe based on a combination of measurements.
For aortic stenosis, the key numbers include the peak blood velocity through the valve and the valve’s opening area. A normal aortic valve has an area greater than 1.5 cm². An area below 1.0 cm² with a peak velocity above 4.0 m/s indicates severe narrowing. For mitral stenosis, a valve area below 1.0 cm² with an average pressure difference above 10 mmHg is classified as severe.
Valve leaking is graded by measuring the width and area of the leaking jet, the size of the leak at its narrowest point (called the vena contracta), and the volume of blood flowing backward per beat. Severe mitral regurgitation, for example, involves a regurgitant volume of 60 mL or more per beat and a regurgitant fraction of 50% or higher. These numbers help determine whether a leaky valve needs monitoring, medication, or surgical repair.
What Your Results Mean in Practice
The echo report is usually read by a cardiologist and sent to your ordering physician within a day or two. You’ll see a mix of qualitative descriptions (“mildly dilated left atrium,” “normal systolic function”) and specific numbers. If everything is normal, you’ll typically see an EF of 55% or above, normal chamber sizes, no significant valve disease, normal diastolic function, and no wall motion abnormalities.
Abnormal findings range from clinically insignificant (trace valve leaking is extremely common and harmless) to findings that change your treatment plan entirely. Moderate or severe valve disease, a low ejection fraction, elevated filling pressures, or new wall motion abnormalities all typically lead to further testing, medication changes, or referral to a specialist. The complete TTE gives your doctor enough data to make those decisions without needing more invasive testing in most cases.