Results 2 578 single pregnancies were assessed the foetuses were classified by an initial ultrasound evaluation 37 (1,4%) presented high risk (≥ 1/50), 1 888 low risk (<1/1 000) and 653 intermediate risk (between 1/51 and 1/1 000). We followed the Fetal Medicine Foundation published quality criteria and the International Society of Ultrasound in Obstetrics and Gynaecology guidelines. All pregnant women between 11 and 13 weeks attended in our unit were assessed with the first-trimester combined plus screening test. Objective: Assessment of the performance of the Kagan biochemical contingent protocol in our population. The contingent test is a two-step protocol of risk assessment that considers all markers only as a contingency in the group with an inconclusive result. The combined plus screening test adds one or more ultrasound markers (ductus venosus, tricuspid flow, nasal bone). The combined first-trimester screening test is the international recommendation for prenatal screening of trisomy 21. Prenatal screening of trisomy 21 in Peru through the first-trimester contingent combined plus screening test. DIEZ CHANG, Guillermo y BAZAN LOSSIO DE DIEZ, Magdalena Gladys.
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