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An ultrasound at this point will show many but not all of the possible defects of the skeletal and major organ systems. The heart has been formed as a four-chambered structure since the sixth week (and before this in another form) and develops in size from then on. At this point, probably less than a third of heart defects can be detected. Certainly the major ones can.

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16y ago
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Q: Does an ultra sound at 17 weeks pregnancy show birth defects and is the heart fully developed then?
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