Revolutionary Smartphone App Transforms Pregnancy Monitoring with At-Home Ultrasound Capabilities

A groundbreaking mobile app is set to empower pregnant women by enabling them to monitor their baby’s prenatal heartbeat from home. The innovation addresses critical gaps in maternal healthcare, particularly for those experiencing perinatal anxiety, which affects one in five pregnant women.

DopFone, developed by researchers at Georgia Tech, transforms any smartphone speaker into a Doppler radar. The app emits a low-pitched ultrasound and detects reflected signals from abdominal surface vibrations caused by a fetal heartbeat. This technology provides a reliable way to track fetal heart rate between doctor’s visits.

Alex Adams, an assistant professor in Georgia Tech’s School of Interactive Computing, conceived the idea for DopFone after he and his wife, Elise, endured two miscarriages. During her pregnancies, Elise struggled to reliably measure the fetal heart rate with standard Doppler monitors. These challenges highlighted significant gaps in maternal healthcare, especially for high-risk pregnancies.

“There are a lot of great devices in hospitals and clinics, but there’s not much outside of those venues, even for high-risk pregnancies. This is about filling the gaps between checkups.” — Alex Adams

Poojita Garg, who collaborated with Adams while completing her master’s degree at Georgia Tech, is now pursuing her PhD at the University of Washington under the guidance of Professor Swetak Patel. Patel earned his PhD from Georgia Tech in 2008. Garg is leading DopFone’s first clinical trials in partnership with the University of Washington School of Medicine.

In initial testing, Garg evaluated DopFone on 23 patients, achieving a measurement accuracy of plus-minus 4.9 beats per minute. This result falls well within the clinical standard range of eight beats per minute for reliable fetal heart rate measurement. Adams noted that in most cases, the app measured within two beats per minute, with an error rate of less than 1%.

According to a study from the Yale School of Medicine, approximately one million pregnancies in the US end in miscarriage each year. Adams suggests the actual number may be higher due to underreporting. While it remains unclear whether DopFone can reduce miscarriage rates, consistent at-home data collection could provide valuable insights into the events leading up to a miscarriage.

“From there, we can take preventative action. If nothing else, we can give a sense of comfort to those who may be worried.” — Alex Adams

Beyond clinical accuracy, DopFone offers a low-cost alternative to traditional portable fetal heart rate monitors. Adams and Garg envision the app as a solution for pregnant women in areas with limited or inaccessible healthcare, including “maternity deserts”—regions where individuals must travel long distances to reach a hospital.

“There’s a lot of potential for using it in what doctors like to call maternity deserts. These are areas where a pregnant person, at the time of delivery, would have to travel long distances to reach a hospital. This technology will be useful globally in underdeveloped areas of the world.” — Poojita Garg

The researchers emphasize that external add-ons or attachments are not part of their design goals. Instead, they prioritize leveraging existing smartphone technology to maximize accessibility and affordability.