<Li> Heart rate display: some Dopplers automatically display the heart rate on a built - in LCD; for others the fetal heart rate must be counted and timed by the practitioner . </Li> <P> A major advantage of being able to record and share the recording is that it can be emailed to a healthcare professional to be checked if there are any concerns about whether or not it is the fetus's heart rate and whether or not is normal . Typically, they work from about 12 weeks . </P> <P> The use of the word Sonicaid for Doppler fetal monitors comes from the products of the UK company Sonicaid Ltd . Sonicaid products included the D205 / 206 portable fetal Dopplers and FM2 / 3 / 4 series of fetal monitors . The company was acquired by Oxford Instruments in 1987 to form Oxford Sonicaid . </P> <P> It was recently demonstrated that continuous Doppler enables the auscultation of valvular movements and blood flow sounds that are undetected during cardiac examination with a stethoscope in adults . The Doppler auscultation presented a sensitivity of 84% for the detection of aortic regurgitations, while classic stethoscope auscultation presented a sensitivity of 58% . Moreover, Doppler auscultation was superior in the detection of impaired ventricular relaxation Since the physics of Doppler auscultation and classic auscultation are different, it has been suggested that both methods could complement each other . </P>

When can fetal heartbeat be detected with doppler