Analysis of trisomy 21 risk in early prenatal screening

Abstract

Early prenatal screening that includes ultrasound diagnostics, study of serum markers of PAPP-A and β-HCG, audit plays an important role in the prevention of congenital and hereditary diseases. The results of the study were processed with «Astraia». Analysis of the results of early prenatal screening in the Ivanovo region for the period 2013-2019 showed that when screening coverage, on average, 85.3% of pregnant women registered before 14 weeks of gestation, 157 cases of chromosomal pathology and 126 cases of congenital malformations were detected. However, in 55 cases, the diagnosis of fetal chromosomal pathology was not suspected during screening, and the patients were not at risk and gave birth to sick children (all children had trisomy 21). At the same time, in 1/3 of cases (in 19 patients - 34.5%), the risk of trisomy 21 was estimated as intermediate and was in the range from 1:100 to 1:1000, including in 3 women (5.5%) - in the range from 1:100 to 1:300. We suppose that patients with an intermediate risk of fetal chromosomal abnormalities need further examination to verify the diagnosis, and they should be informed about the possibilities of a non-invasive prenatal test.