An echocardiogram is safe during pregnancy. It uses sound waves, not radiation, to create images of the heart, posing no known risk to you or your baby. Both major types of echo, the standard chest-wall version and the less common probe-down-the-throat version, are considered safe for pregnant patients.
Why an Echo Is Safe
An echocardiogram works the same way as the ultrasound you get to check on your baby. A transducer sends high-frequency sound waves into your body, and the machine builds an image from the echoes that bounce back. The FDA confirms there is no ionizing radiation exposure with ultrasound imaging, which means it carries none of the risks associated with X-rays or CT scans.
Large-scale safety data backs this up. A WHO systematic review and meta-analysis pooling multiple randomized controlled trials found no statistically significant long-term effects on childhood growth, speech development, school performance, behavioral scores, or neurological outcomes from prenatal ultrasound exposure. Pooling of eight case-control studies also found no increased risk of childhood cancer.
Maternal Echo vs. Fetal Echo
If your doctor ordered an echocardiogram during pregnancy, it helps to know which heart they’re looking at. A maternal echocardiogram examines your heart: its chambers, valves, pumping strength, and blood flow. A fetal echocardiogram examines your baby’s heart in much greater detail than a standard prenatal ultrasound, showing the chambers, valves, blood flow patterns, and major vessels. Both tests use the same underlying technology and are equally safe. The difference is simply which heart is being evaluated and why.
Why You Might Need One
Pregnancy puts significant demands on your cardiovascular system. Starting in the first trimester and peaking by the second, your blood volume, heart rate, and cardiac output all increase while your blood pressure and vascular resistance drop. These shifts can unmask heart problems that were previously silent or worsen existing ones.
The most common reason doctors order a maternal echo during pregnancy is new cardiac symptoms like shortness of breath, chest pain, or palpitations. In a study of 226 echocardiograms performed on 205 pregnant women, cardiac symptoms accounted for about 35% of referrals. A history of prior heart disease was the strongest predictor of actually finding something abnormal on the scan, more than doubling the odds compared to women without that history. Other factors linked to abnormal findings included tobacco use, having had multiple pregnancies, and being in the postpartum period.
An echo is also the primary tool for diagnosing peripartum cardiomyopathy, a rare but serious condition where the heart muscle weakens late in pregnancy or shortly after delivery. The diagnosis requires showing that the heart’s pumping efficiency (ejection fraction) has dropped below 45%. Women whose pumping function is closer to normal at the time of diagnosis tend to recover faster and more completely.
Standard vs. Transesophageal Echo
The vast majority of pregnant patients get a transthoracic echocardiogram (TTE), the standard version where a technician presses a probe against your chest. It is painless, noninvasive, and the first-line imaging tool for monitoring heart valve function and chamber size during pregnancy.
In rare cases, a transesophageal echocardiogram (TEE) may be needed. This involves a thin, flexible probe guided down your throat to get closer images of the heart from behind. It sounds more involved, and it is, but cardiology guidelines describe TEE as “relatively safe during pregnancy.” It’s typically reserved for situations where the chest-wall approach can’t get a clear enough picture, such as evaluating complex congenital heart defects or checking a mechanical heart valve for blood clots.
What About Contrast Agents?
Most pregnancy echocardiograms do not use contrast. In some non-pregnant patients, a small amount of contrast material is injected into a vein to improve image quality. However, contrast-enhanced ultrasound has not been approved by leading medical societies for use during pregnancy. A small number of case reports (six patients in one retrospective study) showed no adverse fetal or maternal events when contrast was used, but the data is extremely limited. If your doctor is considering contrast, it would only be in an unusual clinical situation where the benefit clearly outweighs the uncertainty.
What the Test Feels Like
A standard maternal echo is painless and takes roughly 30 minutes to two hours depending on complexity. You lie on an exam table, typically tilted slightly onto your left side. This left-side positioning matters more as pregnancy progresses: by the third trimester, lying flat on your back can compress a major vein (the inferior vena cava) under the weight of the uterus, causing a drop in blood pressure and a racing heart. Tilting to the left shifts the uterus off that vein and keeps blood flowing normally.
A technician applies gel to your chest and moves a handheld probe across different areas to capture images of your heart from multiple angles. You may hear whooshing sounds if Doppler is used to measure blood flow. No fasting is required, no full bladder is needed, and you can eat and drink normally beforehand. Wearing a two-piece outfit makes it easier since you’ll need access to your chest.
What Doctors Look For
The echo gives your care team a detailed, real-time picture of how well your heart is handling the extra workload of pregnancy. Key measurements include your ejection fraction (the percentage of blood your heart pumps out with each beat), the size of your heart chambers, how well your valves open and close, and whether there’s any fluid around the heart or blood clots inside it.
These numbers serve as a baseline if you have known heart disease, or as a diagnostic snapshot if you’ve developed new symptoms. For conditions like peripartum cardiomyopathy, the echo isn’t just used once. Follow-up scans track whether your heart function is improving, staying the same, or getting worse, which directly shapes treatment decisions and helps predict long-term recovery.