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Several randomized controlled trials have reported no association between Doppler exposure and birth weight, Apgar scores, and perinatal mortality.One randomized controlled trial, however, came to the result of a higher perinatal death rate of normally formed infants born after 24 weeks exposed to Doppler ultrasonography (RR 3.95, 95% CI 1.32–11.77), but this was not a primary outcome of the study, and has been speculated to be due to chance rather than a harmful effect of Doppler itself. The bright white circle center-right is the head, which faces to the left.

This includes checking the status of the limbs and vital organs, as well as (sometimes) specific tests for abnormalities.Current evidence indicates that diagnostic ultrasound is safe for the unborn child, unlike radiographs, which employ ionizing radiation.Randomized controlled trials have followed children up to ages 8–9, with no significant differences in vision, hearing, school performance, dyslexia, or speech and neurologic development by exposure to ultrasound.In normal state, each body tissue type, such as liver, spleen or kidney, has a unique echogenicity.Fortunately, gestational sac, yolk sac and embryo are surrounded by hyperechoic (brighter) body tissues.

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