Instrutions on using doppler

How long should the fetal heart rate be measured for accuracy?

How long should the fetal heart rate be measured for accuracy?
Usually, 2-3 minutes is sufficient. You can calculate the average heart rate by dividing the number of beats by the time. A heart rate of 120-160 beats per minute is considered normal.

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 When using the BabyEcho fetal doppler, how do I locate the fetal heart?
 Why does the fetal heart sometimes make loud, rhythmic sounds when I'm listening to it? Is it normal, or is the baby moving?

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