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A triple screen is a blood test that measures three things called alpha-fetoprotein, human chorionic gonadotropin and unconjugated estriol. The results of the blood test can help your doctor see if your baby may be at higher risk for certain birth defects such as Down syndrome and neural tube defects. ! Z$ v" q1 l' N2 r5 {% n " r/ A- r9 ?7 V/ v( L5 T" A( }就象一般验血的过程, 测三项指标,主要针对唐氏. 指标不满足,会建议做羊穿.