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  • How exactly does a Doppler work? | BabyBeat Blog

    How exactly does a Doppler work?

    A fetal Doppler “listens” to sounds waves to monitor the heart rate of an unborn baby. It is actually picking up the small, high-frequency sound waves that are reflected off the fetal heart. Ultrasound waves are sent and received through the mother’s abdomen to the fetal Doppler. It is the most common method used to monitor a fetus. It is non-invasive and there are no known risks to the fetus.

    To use the Doppler, ultrasound gel is put on the mother’s stomach. This gel helps the sound waves travel between the mom’s belly and the Doppler probe as ultrasound will not travel through air. It also helps keep static and outside noises from interfering with hearing the fetal heart tones. Once the gel is applied the Doppler probe is moved slowly across the mother’s belly until the heartbeat is heard.

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