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Q我现在31岁,二胎孕19周,之前做的唐筛早期很低风险,NT值1.0,但唐筛中期21-三体是1:474,是临界值。您认为有必要再做进一步检查吗?羊水穿刺或者无创DNA哪个好?ANT是妊娠早期胎儿颈部的透明层厚度,与淋巴系统的发育相关。研究资料显示,约有10%的NT增厚的胎儿染色体异常,还有部分NT增厚的胎儿伴有结构畸形,当然,也有虽然NT增厚但胎儿出生后是正常的情况。唐氏筛查是妊娠15周至20周之间做的血清学筛查,根据实验室情况,临界值分别为
Q I am 31 years old and have a second trimester of pregnancy for 19 weeks. Earlier screening was done with a very low risk of NT early, but the mid-Tang 21-trisomy was 1: 474, the threshold. Do you think it is necessary to do further examination? Amniocentesis or non-invasive DNA which is better? ANT is the thickness of the transparent layer of the fetus’s neck during early pregnancy, and the development of the lymphatic system. Research data show that about 10% of NT thickened fetal chromosomal abnormalities, as well as some NT thickened fetus with structural deformity, of course, although there are NT thickening but the fetus is normal after birth. Down’s screening is serological screening done between 15 weeks and 20 weeks of pregnancy, according to laboratory conditions, the critical values were