Doctors order echocardiograms to get a real-time picture of how your heart is structured and how well it’s pumping. It’s one of the most common cardiac tests, and the reasons range from investigating a new symptom like chest pain or shortness of breath to monitoring a known condition over time. If your doctor ordered one, it doesn’t necessarily mean something is wrong. It often means they want to rule something out or get a baseline look at your heart.
Investigating Symptoms
The most straightforward reason for an echocardiogram is that you’re experiencing symptoms that could point to a heart problem. Chest pain, shortness of breath, dizziness, fainting, swelling in the legs, or an irregular heartbeat can all prompt the order. These symptoms have dozens of possible causes, and an echo helps your doctor quickly see whether your heart’s structure or pumping function is contributing.
For example, if your heart isn’t pumping enough blood to meet your body’s needs, you’ll feel fatigued and short of breath. The echo can show whether the heart muscle is weak, whether a valve isn’t opening or closing properly, or whether fluid has built up around the heart. It gives your doctor answers that a stethoscope and an EKG alone can’t provide.
Checking Heart Valve Problems
Echocardiograms are the primary tool for diagnosing and grading valve disease. Your heart has four valves that open and close with every beat, and two main things can go wrong: a valve can become too narrow (stenosis), restricting blood flow, or it can leak (regurgitation), allowing blood to flow backward. A valve can also prolapse, meaning it bulges out of position.
The echo shows blood flowing through each valve in real time, which lets your doctor see exactly how severe the problem is. In aortic valve stenosis, for instance, the echo reveals whether the narrowing is mild or severe enough to weaken the heart muscle. This distinction drives treatment decisions, from watchful waiting to surgery. If your doctor heard an unusual heart murmur during a routine exam, that alone is a common reason to order an echo to find out what’s causing it.
Measuring Pumping Strength
One of the most important numbers an echocardiogram produces is your ejection fraction, which tells you what percentage of blood your heart pushes out with each beat. A normal ejection fraction falls between about 50% and 70%. For men specifically, the normal range is 52% to 72%; for women, 54% to 74%.
When the ejection fraction drops to 40% to 49%, pumping ability is mildly reduced. Below 39%, it’s classified as heart failure with reduced ejection fraction. Your doctor may order an echo specifically to measure this number if you have risk factors for heart failure, such as a previous heart attack, long-standing high blood pressure, or diabetes. It’s also used to track whether heart failure treatment is working by comparing ejection fractions over time.
Detecting Structural Defects
Some people are born with holes or other structural abnormalities in the heart that may not cause symptoms until adulthood, or may be discovered incidentally. An echocardiogram is the main test used to diagnose an atrial septal defect, a hole in the wall between the heart’s upper chambers. It shows the size of the defect, the direction blood is flowing through it, and whether it’s affecting the heart’s overall function.
Other congenital issues the echo can reveal include abnormal connections between the heart and major blood vessels, thickened heart walls (as seen in hypertrophic cardiomyopathy), and enlarged heart chambers. High blood pressure alone can cause the heart walls to thicken over time, and an echo can show whether that remodeling has started.
After a Stroke or Blood Clot
If you’ve had a stroke or a blood clot that traveled through your bloodstream, your doctor will often order an echocardiogram to find out whether the clot originated in the heart. Blood clots can form in the heart’s chambers, particularly in people with irregular heart rhythms like atrial fibrillation, and then travel to the brain.
A standard echocardiogram is usually the first step, but it has limitations. It’s not great at detecting small clots in the left atrial appendage (a small pouch in the heart where clots commonly form) or complex plaque in the aorta. When doctors need a closer look, they use a transesophageal echocardiogram, which involves passing a small ultrasound probe down the throat. In one large study of stroke patients, this approach detected at least one potential source of embolism in nearly half of cases, including clots, spontaneous swirling of blood (a sign of sluggish flow), complex aortic plaque, and holes between the heart’s chambers.
Fluid Around the Heart
The heart sits inside a thin sac called the pericardium. When fluid builds up in that sac, whether from infection, inflammation, cancer, or kidney disease, an echocardiogram is the fastest and most reliable way to see it. The echo shows how much fluid is present and whether it’s compressing the heart chambers.
In serious cases, enough fluid accumulates to prevent the heart from filling properly, a condition called cardiac tamponade. The echo can detect signs of this compression, sometimes before the classic clinical signs appear. Patients with moderate or large fluid collections may show echocardiographic evidence of the right atrium being squeezed even when blood pressure and other vital signs still look relatively normal. This makes the echo valuable for catching the problem early.
Monitoring During Cancer Treatment
Certain chemotherapy drugs, particularly those targeting HER2 (used in some breast cancers), can weaken the heart muscle as a side effect. Doctors use echocardiograms to monitor for this throughout treatment. Current guidelines from both the National Comprehensive Cancer Network and the European Society of Cardiology recommend checking the ejection fraction every three months during HER2-targeted therapy.
If the echo shows a significant drop in pumping function, your oncologist and cardiologist can adjust or pause treatment before permanent damage occurs. This type of surveillance echocardiogram is routine, not a sign that something has gone wrong. It’s built into the treatment plan from the start.
Standard vs. Transesophageal Echo
The standard echocardiogram, called a transthoracic echo, is done by pressing an ultrasound wand against your chest. It’s painless, requires no special preparation for most people, and typically takes 30 to 60 minutes. A gel is applied to your skin, and you lie on your side while the technician captures images from different angles.
A transesophageal echo is more involved. Because the esophagus runs directly behind the heart, placing the ultrasound probe there gives much sharper images of structures at the back of the heart, particularly the valves, the left atrium, and the aorta. Your throat is numbed, you’re typically sedated, and the probe is guided down your esophagus. Doctors reserve this approach for situations where the standard echo can’t provide enough detail: evaluating for endocarditis (infection of a heart valve), searching for clots before a procedure, guiding heart surgery in real time, or getting a better look at a valve before repair.
In most cases, a standard echo comes first. If it answers the clinical question, no further imaging is needed. The transesophageal version is ordered only when the added detail justifies the mild discomfort and small procedural risk.
Routine Follow-Up and Baseline Testing
Not every echocardiogram is ordered because of a symptom or emergency. Doctors also use them to establish a baseline before starting medications that can affect the heart, to recheck a known valve problem at regular intervals, or to evaluate how well a treatment is working. If you had a heart attack six months ago and started new medication, a follow-up echo tells your doctor whether your heart’s pumping strength has improved, stayed the same, or declined.
Similarly, athletes with a family history of sudden cardiac death may get an echo as a screening tool, and people with certain genetic conditions like Marfan syndrome undergo periodic echocardiograms to monitor the aorta for dangerous enlargement. The test is low-risk, uses no radiation, and provides a wealth of information, which is why it’s one of the most frequently ordered cardiac studies.