The Use of Dopplers in Fetal Monitoring

It is becoming increasingly recognised by the medical profession that it can be very beneficial for pregnant women to use a fetal doppler at home in between visits to their GP or hospital. This is particularly the case where mothers are anxious perhaps because they have previously had a difficult pregnancy or a miscarriage.

It has been found that when such a pregnant women buys or rents one of the current range of reasonably priced lightweight hand held fetal dopplers her confidence and wellbeing increases.

How Fetal Dopplers Work

Fetal doppler technology is based on the Doppler shift principle. This theory was first discovered by Christian Doppler an Austrian physicist in 1842. Doppler discovered that sound waves from a moving source would be compressed or expanded, or that the frequency would change.

Dopplers work on the principle of listening to reflections of small, high frequency sound waves (ultrasound). These ultrasound waves are generated by microscopic vibrations of pizeoelectric crystals. When the waves are reflected from moving objects, such as a foetal heart the frequency changes slightly. It is this change that is analysed by the electronics of the doppler and converted into a sound that you can hear or a digital display of the heart rate.

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The Use of Dopplers in Fetal Monitoring

How Fetal Dopplers Work