Human Growth and Development / Unit 2 HGD 0199 short lesson, about 20 seconds
Ultrasound and Serum Screening
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The idea
Ultrasound uses high-frequency sound waves to image the fetus's structures and organs; maternal serum tests measure proteins in the pregnant person's blood.
In practice
A transvaginal ultrasound early in pregnancy, and a blood test at eleven to thirteen weeks.
Where people slip
Serum tests screen for risk rather than diagnose; an unusual result leads to further testing.
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