This study will document the detection rate and false positive rate as well as failure rate of a new prenatal screening approach ('Smart NIPT') as described at www.vanadisdx.com and implemented in an academic laboratory with limited molecular testing experience. Testing will be performed on samples from a general risk pregnancy population, with additional high-risk cases added to improve confidence in the detection rate. Additional characteristics of this non-NGS test such as turn-around time, costs (equipment, training, per test), results reporting, fetal sex, fetal fraction, and quality measures will also be examined.
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Down syndrome detection rate
Timeframe: Karyotype at chorionic villous sampling (CVS)/amniocentesis within 48 hours of enrollment OR at examination of products of conception if fetal loss up to 30 weeks post enrollment OR at newborn examination 24-48 hours after birth
Down syndrome false positive rate
Timeframe: Karyotype at chorionic villous sampling (CVS)/amniocentesis within 48 hours of enrollment OR at examination of products of conception if fetal loss up to 30 weeks post enrollment. OR negative newborn examination 24-48 hours after birth
Down syndrome failure rate
Timeframe: Documentation of the failed result for Down syndrome will be considered confirmed when no results are returned for the second tested sample, typically within 14 days after enrollment.