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Objectives: Assessment the effectiveness of non-invasive prenatal screening (NIPS) for identifying pregnant women at high risk of giving birth to a child with Down syndrome. Materials and Methods: The retrospective cohort study included 25798 pregnant women who underwent NIPS in Russia from January 2013 to December 2018. 21042 and 4756 participants underwent tests from the Natera laboratory, USA (non-invasive prenatal test 1, NIPT-1) and the Genomed laboratory, Russia (non-invasive prenatal test 2, NIPT-2), respectively. Results: A high risk of trisomy 21 (T21) was detected in 544 cases (2.59%). The mean age in women at high risk of T21 was 37.3 years. According to the NIPT results, in patients who revealed a low risk of T21, the mean age was 33.8 years (P |
