Challenges in the diagnosis of fetal non‐chromosomal abnormalities at 11–13 weeks

Abstract Objective To examine the performance of the 11–13 weeks scan in detecting non‐chromosomal abnormalities. Methods Prospective first‐trimester screening study for aneuploidies, including basic examination of the fetal anatomy, in 45 191 pregnancies. Findings were compared to those at 20–23 we... View More