Fetal Heart Ultrasound: Preparation, Procedure and Results

A fetal heart ultrasound, also called a fetal echocardiogram, uses sound waves to create detailed images of a baby’s heart during pregnancy. It can assess heart anatomy, blood flow and rhythm, helping the care team plan appropriate monitoring or care when needed.

Overview: what is a fetal heart ultrasound?

A fetal heart ultrasound is a detailed scan performed during pregnancy to examine a developing baby’s heart. It is also called a fetal echocardiogram or fetal echo. The test uses high-frequency sound waves, not radiation, to produce moving images of the heart and blood flow.

It may be recommended when a routine pregnancy scan does not show all heart views clearly, when there is a family or pregnancy-related risk factor, or when an irregular fetal heartbeat is suspected. A normal result can be reassuring, while an unexpected result helps the pregnancy care team decide whether any extra monitoring, testing or specialist planning is appropriate.

The scan is commonly performed between weeks 18 and 24 of pregnancy, although timing can vary. In selected circumstances, such as concerns about rhythm or a known risk, it may be performed earlier or repeated later in pregnancy.

What the scan assesses: fetal heart ultrasound anatomy and function

A detailed fetal heart ultrasound assesses the heart’s chambers, walls, valves and major blood vessels. The specialist also reviews the connections between the heart and vessels, the direction of blood flow and the rate and regularity of the heartbeat. These views help evaluate fetal heart ultrasound anatomy in a structured way.

The fetal heart ultrasound technique includes two-dimensional imaging and Doppler ultrasound. Doppler measures moving blood and can show its speed and direction. This helps clinicians assess circulation through valves and vessels and look for patterns that may require closer review.

Not every heart condition can be identified before birth. Image quality can be affected by the baby’s position, pregnancy stage, abdominal tissue and the amount of amniotic fluid. Some conditions also develop or become more noticeable later in pregnancy or after delivery.

Who may need a fetal echocardiogram?

A fetal echo is not routinely needed in every pregnancy. It may be advised after an abnormal or incomplete heart view on a standard prenatal ultrasound, a suspected rhythm concern or a possible structural difference in the heart.

Other reasons may include a parent, sibling or close relative with certain congenital heart conditions; maternal diabetes that existed before pregnancy; certain autoimmune conditions; exposure to medicines known to affect fetal development; or a pregnancy involving assisted reproduction. The recommendation depends on the individual clinical situation and should be discussed with an obstetrician, maternal-fetal medicine specialist or pediatric cardiologist.

Having a risk factor does not mean the baby has a heart condition. The purpose of referral is to obtain clearer, specialist-level information and support informed prenatal care.

Fetal ultrasound preparation: what to expect before the test

Most people need very little fetal ultrasound preparation. They can generally eat, drink and take prescribed medicines as usual unless their clinician gives different instructions. Wearing a comfortable two-piece outfit can make access to the abdomen easier.

What not to do before a heart ultrasound? There are usually no strict restrictions. It is sensible to avoid stopping prescribed medicines, using alcohol or nicotine products, or making dietary changes based on internet advice. A person should follow any individual instructions from the imaging center, particularly if another test is scheduled on the same day.

Do I need to be on an empty stomach for a fetal echo test? No. Fasting is not generally required for a fetal echocardiogram because the images are obtained through the abdomen rather than through the digestive system. A person can have a normal meal and drink fluids unless their own healthcare team advises otherwise.

Fetal heart ultrasound procedure: step by step

At the appointment, the sonographer or specialist explains the examination and asks relevant questions about the pregnancy and health history. The pregnant person usually lies on an examination bed, sometimes slightly tilted to improve comfort and circulation.

A clear gel is placed on the abdomen, and a handheld ultrasound probe is moved gently over the skin. The probe sends sound waves into the body and receives returning signals, which are displayed as images. Pressure may be felt from the probe, but the procedure should not be painful.

A fetal heart ultrasound protocol typically includes standard views of the four heart chambers, the outflow vessels, heart rhythm and blood flow. The clinician may ask the patient to change position or take a short break if the baby’s position makes views difficult. The scan often lasts 30 to 60 minutes; it can take longer when detailed measurements or additional views are needed.

High-quality examinations rely on clinicians with appropriate fetal heart ultrasound training, including fetal cardiac sonographers and pediatric cardiology or maternal-fetal medicine teams. In some cases, a repeat scan is recommended simply because a complete set of views was not possible that day.

Benefits, risks and recovery after the scan

The main benefit of fetal heart ultrasound is detailed information about the baby’s heart before birth. When a heart difference is identified, early knowledge may help families understand the finding, arrange follow-up and plan delivery in a setting with appropriate newborn services if required.

Ultrasound has been used in pregnancy for decades and does not use ionizing radiation. A fetal echocardiogram is considered noninvasive, and no recovery time is expected. The gel can be wiped away after the scan, and most people can immediately return to normal daily activities.

There may be emotional strain while waiting for information, especially if the scan was recommended after another test. Asking the care team when and how results will be shared can help provide clarity. A support person may be helpful at the appointment where permitted.

Results and next steps

How long does it take for heart ultrasound results to come back? Preliminary impressions may be discussed immediately when the scan is performed by a qualified specialist. However, a complete report may take longer if images require formal review, comparison with other scans or discussion within a specialist team. The clinic can explain its expected reporting process.

What happens if they find something on an echocardiogram? The specialist will explain what was seen, how certain the finding is and whether additional imaging is needed. Some findings are minor or resolve without treatment, while others may require repeat fetal echocardiograms, genetic counseling or consultation with pediatric cardiology and neonatal specialists. Further tests are recommended only when they may provide useful information for pregnancy care.

If a congenital heart difference is confirmed or strongly suspected, the team may discuss delivery planning and post-birth assessment. The goal is to ensure that the baby receives the right level of care at the right time. Acibadem International’s multidisciplinary specialists and JCI-accredited hospitals can support diagnosis and care planning for international patients when fetal cardiac concerns require specialist evaluation.

When to seek medical care

A fetal heart ultrasound itself is usually a planned outpatient examination and does not cause symptoms requiring recovery care. However, a pregnant person should contact their obstetric care team promptly if they have vaginal bleeding, fluid leakage, severe or persistent abdominal pain, fever, severe headache, vision changes, sudden swelling, or a noticeable reduction in fetal movement after movement has become regular.

Urgent pregnancy symptoms should be assessed according to local emergency guidance, rather than waiting for a scheduled ultrasound appointment. For questions about an ultrasound referral, test preparation or results, the most appropriate contact is the obstetrician, midwife or fetal medicine clinic.

Follow-up appointments are important when repeat imaging is advised. A repeat scan may be needed because of fetal position or changing heart development and does not, by itself, confirm that there is a problem.

Frequently asked questions

Is a fetal heart ultrasound safe for the baby?

A fetal heart ultrasound uses sound waves rather than radiation and is considered noninvasive. It is performed by trained professionals using established pregnancy imaging practices. The care team recommends it when the additional heart information may be helpful.

Is a fetal echocardiogram different from a routine pregnancy ultrasound?

Yes. A routine anatomy scan includes screening views of the fetal heart along with many other body structures. A fetal echocardiogram is more focused and detailed, with specialized views of the heart’s structure, blood flow and rhythm.

Can a fetal heart ultrasound detect every heart condition?

No imaging test detects every possible heart condition before birth. Some conditions are subtle, may develop later in pregnancy or are easier to identify after delivery. A normal fetal echocardiogram is reassuring but does not eliminate every possible cardiac concern.

Why might a fetal heart ultrasound need to be repeated?

A repeat scan may be necessary if the baby’s position, movement or other technical factors limited the views. It may also be used to monitor a known finding or a rhythm concern over time. A repeat examination does not necessarily mean there is an abnormality.

Can I bring someone with me to a fetal echocardiogram?

Many centers allow a support person, but policies vary by facility and may depend on clinical circumstances. It is best to ask when booking the appointment. The clinic can also explain whether children are permitted in the scan room.

What questions should I ask after a fetal heart ultrasound?

Helpful questions include whether all required heart views were obtained, whether any finding needs follow-up and when the formal report will be available. If a concern is identified, patients can ask what it may mean, how certain the result is and which specialists may be involved next.

References

• American College of Obstetricians and Gynecologists
• American Society of Echocardiography
• International Society of Ultrasound in Obstetrics and Gynecology
• Centers for Disease Control and Prevention
• National Health Service

This article is for general information only and is not a substitute for professional medical advice. Please consult a qualified doctor about your individual situation.