Quality control model for biochemical and ultrasound markers in prenatal screening for fetal aneuploidies with laboratory-centralized management by Ramírez Garrido, F, Ulibarrena Estevez, J, Valverde Cuesta, S, Ramayo Barrio, E, Camacho Carretero, A

“…In the case of nuchal translucency (NT), the WIHRI method was employed to control quality, and CUSUM was applied to each ultrasound operator with the values extracted from the computer software database. Results: For the biochemical parameters CV was below 4%. …”