The First Trimester Screening is a non-invasive evaluation that combines a maternal blood test and an ultrasound of the baby’s neck between 11-14 weeks to identity babies at risk for Down’s syndrome (trisomy 21) and Edward’s syndrome (trisomy 18). Approximately 85% of babies affected by trisomy 21 and 95% of baby with trisomy 18 will be identified by this test. About 5% of normal babies will have a false positive test. A positive test does not mean your baby has trisomy 21 or trisomy 18, but rather that you are a candidate for further testing.

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