Prenatal Diagnosis Also known as a sonogram, an ultrasound reflects sound waves off of the fetus and then is shown on a special computer screen. This test is not very clear and physical features such as limb, heart, brain, and spine abnormalities can't be seen until 16-18 weeks of pregnancy. The ultrasound mostly only detects things of structural and/or physical nature. Things like mental retardation, blindness, and deafness can't be detected by an ultrasound nor can it detect chromosome abnormalities such as down syndrome. Ultrasound may lead to recom....

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