A fetal echocardiogram is a highly specialized ultrasound scan designed to evaluate the structure, function, and blood flow of your unborn baby's heart. While a routine pregnancy scan checks the baby’s heart briefly, a fetal echo is a focused, detailed examination performed by a specialist (such as a pediatric cardiologist or maternal-fetal specialist).
This scan is usually scheduled between 18 and 24 weeks of pregnancy, when the baby's heart is large enough to be examined in detail.
Common Indications for a Fetal Echocardiogram
- A routine pregnancy ultrasound flagged a suspected heart issue or abnormal heart rate.
- A parent or sibling was born with a congenital heart defect.
- The mother has medical conditions like diabetes, lupus, or took certain medications during early pregnancy.
- Genetic abnormalities or other structural issues were detected in the baby.
- The pregnancy was conceived through assisted reproductive technology (IVF).
What exactly does a fetal echocardiogram show?
The scan shows the four chambers of the baby's heart, the major blood vessels (aorta and pulmonary artery) entering and leaving the heart, and the function of the heart valves. It measures the blood flow direction and speed, and checks for holes in the heart walls or abnormal heart rhythms.
How should I prepare for a fetal echocardiogram?
No special preparation is needed. You do not need to fast, and you do not need a full bladder, as the baby is already large enough to be seen easily.
Do I need to stop taking medication?
No. Continue taking all your pregnancy supplements and prescribed medications as usual.
What happens when I arrive for my scan?
You will go to a private scan room. The specialist will ask you to lie on your back on the couch and expose your abdomen.
How is the procedure performed?
Warm gel will be applied to your abdomen. The specialist will place the ultrasound probe on your skin and slide it over your womb. They will focus exclusively on the baby's chest, taking detailed measurements. You will see colored maps of blood flow (color Doppler) and hear rhythmic whooshing sounds representing the baby's heartbeat.
How long does a fetal echocardiogram take?
This is a highly detailed scan that takes about 30 to 60 minutes. If the baby is in a difficult position or moving frequently, the specialist may take longer to capture all required views.
Is there any discomfort?
No. The scan is completely painless and safe. You will only feel the warm gel and the pressure of the probe on your abdomen.
Are there risks?
No. Fetal echocardiography uses safe sound waves and has no radiation risks to you or your baby.
Can children have this scan?
This scan is performed on the unborn baby through the mother's abdomen.
Can I have this scan if I am pregnant?
Yes. This scan is designed specifically for pregnant patients who require detailed evaluation of the baby's heart.
When will I get my results?
The specialist will often discuss their findings with you immediately during or right after the scan. A detailed written report will be sent to your obstetrician or referring doctor within 24 hours.
What if the scan finds something?
If a heart defect is detected, try to remain calm. Many heart conditions can be managed effectively. Knowing about a defect before birth allows your medical team to plan the safest delivery location (a hospital with a neonatal cardiac unit) and arrange immediate care or surgery for the baby after birth.
What are the important limitations?
Ultrasound does not use ionising radiation, but a useful result still depends on the clinical question, the operator, the equipment, patient anatomy, and whether the target can be reached by sound waves. Gas, bone, body habitus, pain, movement, and a limited acoustic window can hide disease. A normal scan does not automatically exclude the suspected condition; persistent or worsening symptoms need clinical reassessment and sometimes repeat ultrasound, CT, MRI, laboratory tests, or another specialist test.
Ultrasound should be used for a medical purpose, with output and examination time kept as low as reasonably achievable—especially in pregnancy and with Doppler. Internal scans and procedures require explanation, consent, privacy, and a chaperone according to patient preference and local policy.
Questions to ask your care team
- What exact question should this ultrasound answer, and could anything important remain unseen?
- Is this a screening, diagnostic, surveillance, or procedure-guidance examination, and will the result change care?
- What preparation is required, and should I continue all medicines unless my own clinician gives different instructions?
- When will I receive the signed report, who will explain it, and what symptoms should prompt urgent assessment rather than waiting?
Sources and further reading
- RadiologyInfo.org: Obstetric ultrasound
- AIUM: Prudent clinical use and safety of diagnostic ultrasound
Conclusion
A fetal echocardiogram is a safe and invaluable tool that helps ensure your baby receives the right care immediately after birth if a heart condition is present. There is no special prep required, so simply try to relax during the detailed session.