R. Biagiotti et al., FIRST-TRIMESTER SCREENING FOR DOWNS-SYNDROME USING MATERNAL SERUM PAPP-A AND FREE BETA-HCG IN COMBINATION WITH FETAL NUCHAL TRANSLUCENCY THICKNESS, British journal of obstetrics and gynaecology, 105(8), 1998, pp. 917-920
The aim of this study was to evaluate the potential effectiveness of m
aternal serum pregnancy-associated plasma protein A (PAPP-A) and free
beta-hCG in combination with nuchal translucency thickness in first tr
imester screening for Down's syndrome. Maternal serum levels of PAPP-A
and free beta-hCG were assayed in stored sera from 32 Down's syndrome
and 200 unaffected pregnancies. Fetal nuchal translucency was measure
d by ultrasound at the time of blood sampling. Screening of Down's syn
drome using a combination of maternal age, PAPP-A, free beta-hCG and n
uchal translucency would achieve a detection rate of 75.8% for a false
positive rate of 5%.