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    What is a Doppler scan?   A doppler ultrasound is a noninvasive test that is used to measure the blood flow through the umbilical cord and to the different parts of the baby’s body like his brain and heart. The test shows if he is getting all the  oxygen and nutrients he needs via the placenta.   Regular ultrasounds uses sound waves to produce images but they can’t show blood flow.  Doppler gives doctors an idea about visual or audible...


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