title: Korean-specific parameter models for calculating the risk of Down syndrome in the second trimester of pregnancy.
abstract: The purpose of the current study was to propose a Korean-specific parameter set for calculating the risk of Down syndrome in the second trimester of pregnancy and to determine the screening performances of triple and quadruple tests in Korean women. Using the data on triple or quadruple screening from three hospitals in Korea during 7 yr, we re-converted the concentrations of four serum markers to multiple of median values according to gestational age and maternal weight. After re-calculating the risk of Down syndrome in each pregnancy by multiplying maternal age-specific risk by the likelihood ratio values for the serum markers, screening performances and optimal cut-off values of triple and quadruple tests were analyzed. Among 16,077 pregnancies, 23 cases had Down syndrome (1.4/1,000 deliveries). Compared to the previous program, the tests with new parameters had improved screening performance. The triple and quadruple tests had detection rates of 65.2% and 72.7%, respectively, at a false-positive rate of 5%. The optimal cut-off value for the quadruple and triple tests was 1:250. We have presented a Korean-specific parameter set for Down syndrome screening. The proposed screening test using this parameter set may improve the performance of Down syndrome screening for Korean women.
authors.affiliation: Department of Obstetrics and Gynecology, College of Medicine, The Catholic University of Korea, Seoul, Korea.
authors.forename: Ji Young
authors.initials: JY
authors.lastname: Kwon
authors.forename: In Yang
authors.initials: IY
authors.lastname: Park
authors.forename: Yong Gue
authors.initials: YG
authors.lastname: Park
authors.forename: Young
authors.initials: Y
authors.lastname: Lee
authors.forename: Guisera
authors.initials: G
authors.lastname: Lee
authors.forename: Jong Chul
authors.initials: JC
authors.lastname: Shin
mesh_terms: D000328:Adult; D044466:Asian People; D015415:Biomarkers / Q000097:blood; D004314:Down Syndrome / Q000097:blood / Q000175:diagnosis*; D005260:Female; D005820:Genetic Testing / Q000379:methods*; D006801:Humans; D011237:Predictive Value of Tests; D011247:Pregnancy; D011262:Pregnancy Trimester, Second; D011296:Prenatal Diagnosis / Q000379:methods*; D056910:Republic of Korea; D012306:Risk
chemical_list: D015415:Biomarkers