Doctors at the University of Maryland Center for Advanced Fetal Care are testing a new fetal monitor that may provide information on changes in an unborn baby’s heartbeat over an extended period of time, officials said.

Doctors can use the device, called Monica AN24, to collect data for nearly 24 hours — far longer than when using an ultrasound, which is usually used for about two hours, officials said Wednesday.

The University of Maryland team, which has been using the device for several months, is the only academic hospital in the country testing the system.

The device, which is about the size of an iPod, measures the electrical impulses of the fetus’ heartbeat on the mother’s skin, detected with electrodes similar to an electrocardiogram, or EKG.

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Ultrasound monitoring is limited because it only measures a snapshot in time, said Dr. Ahmet Baschat, a maternal-fetal medicine specialist at the University of Maryland Medical Center.

By monitoring over an extended time, researchers can better spot signs that the fetus is at risk, officials said.

Researchers are using the device for women with high-risk pregnancies and conditions such as preterm labor or preeclampsia.