A Fetal Doppler is one type of fetal monitoring. The fetal heart Doppler is a non-invasive diagnostic instrument used to detect and measure the fetal heart rate. A fetal heart Doppler measures the fetal heart rate by emitting and receiving continuous ultrasonic sound waves and emitting the change or shift in pitch frequency of these sound waves. This is called the Doppler Effect and was discovered by Austrian mathematician and physicist, Christian Doppler (1803-53). Each fetal heart monitor uses a transducer or probe of varying MG HZ (millions of cycles per second), usually 2 or 3, containing piezoelectric crystals which send short sound pulses into the directed area of the body. Every time one of these sound waves is sent the transducer (probe) pauses briefly and listens for the returning echo at which time the fetal heart Doppler determines the depth and direction of each returning sound wave and converts the signal into the fetal heartbeat you hear. This heartbeat is not your baby’s actual heartbeat but a reproduction.
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