Absolutely most of the home fetal heart monitor on the market is a single probe, although it also uses the ultrasound Doppler principle, but it can only monitor the fetal heart rate value, monitoring time is more than 1-2 minutes, and its value is not as accurate as the medical fetal heart monitor, can only be used as a reference data. Although the home fetal heart monitor is not accurate enough, but it can also reflect the condition of the fetus to a certain extent, parents can still buy if they feel the need.
What are the problems with home Doppler fetal heart monitor
1, fetal heart sound is virtual, not real collection. Fetal heart rate played by home fetal heart rate is not the real sound of the fetus, because ultrasound human ear can not be heard, it needs to use ultrasound Doppler means to measure the fetal beat, and then in accordance with the measured frequency of fetal beat, synchronized with the virtual sound, into the fetal heart rate, play to let pregnant women to listen to, which to a certain extent affects the structure of the measurement.
2, home fetal heart rate monitor lack of fetal heart positioning guide, home use is not convenient. Fetal heart monitoring in the hospital, there are professional medical personnel, can quickly locate the fetal heart, while the home Doppler fetal cardiograph, there is no localization guide, you need to rely on the pregnant woman to identify their own judgment, time-consuming and laborious.
3, home fetal heart rate monitor need to use coupling agent, ordinary users can not grasp its usage. And coupling agent applied, will cause a lot of unrealistic body feeling, affecting the use of fetal heart rate monitor.
4, most of the home fetal heart rate monitor only provides 1-2 minutes of listening, it can not continuously monitor the fetal heartbeat changes, for doctors, no practical significance. The real effective fetal heart monitoring must ensure that at least 20 minutes or more, only to meet this monitoring time, in order to be able to provide doctors with an objective assessment of the fetal heart monitoring data analysis, in order to find possible problems from the fetal heart curve trend.
5, the real effective fetal heart monitoring, must contain the average fetal heart rate, 20 minutes fetal heart curve, fetal heart acceleration, fetal heart deceleration, contractions, the number of fetal movements, amplitude variation and other elements, and the need for a double probe, can monitor the fetal heart rate and contractions at the same time, only with the above must have the elements, can be called a fetal heart monitoring, and the home fetal cardiology device is far from achieving this effect.
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6, home fetal cardiometers emit ultrasound capacity is small, but the average user is not very good at operation, can not quickly locate the position of the fetus, which leads to focusing time becomes longer, may have an impact on the fetus, so the U.S. Food and Drug Administration (FDA) explicitly limit the use of Doppler fetal heart monitoring outside the medical institutions.