RESUMEN
OBJECTIVE: To determne whether abnormal results of doble saeening tests for Down syndrome with MSAFP and free B-hCG are associated with adverse pregnancy outcome. METHODS: Between October 1994 and September 1997, 205 among 1731 who were screened had increased risk for Down screening program of CIS biointernational, Fetuses with Chromosomal abnormality or congenital anomalies and less than 35 years of maternal age were excluded from this study. Down syndrome screening test was performed between 14-22 weeks of gestation. RESULTS: Of 1731 women, 205 (13.4%) had increased Down syndrome risk. The pregnancy outcome of women with increased Down syndrome risk were compared with those of women without such risk There were no significant difference in the incidence of preterm labor (6[2.9%] vs 112[7.3%)), premature rupture of the membranes (2[0.9%] vs 56[3.6%]), pregnancy induced hypertension (2[0.9%] vs 36[2.3%]), abruptio placentae (0[0%] vs 2[0.1%]), low birth weight (2[0.9%] vs 21[1.3%]), oligohydramnios (4[1.9%] vs 10[0.6%]), intrauterine fetal death (0[0%] vs 2[0.1%]). CONCLUSION: False positive results of Down syndrome screening test in the 2nd trimester do not appear to be associated with adverse pregnancy outcome. But there are statistically significant increases of adverse pregnancy outcome in wemen with elevation of MSAFP or elevation of free B-hCG.