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Health Tip: Ultrasound Helps Evaluate Fetal Health (HealthDay News) -- An obstetric ultrasound is a scan that uses high-frequency sound waves to show an image of a fetus inside the uterus. It is often requested by obstetricians at intervals throughout a pregnancy to check on the fetus's health. According to the Radiological Society of North America, an ultrasound may be used to confirm:
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