Chorionic villous sampling is needed in all except
Chorionic villous sampling(CVS) is done at the 10 - 13 week of gestation to diagnose conditions which could be debilitating or life threatening for the unborn fetus. Neural tube defects are best assessed at a later gestation around 20 weeks though the earliest to be picked up is ANENCEPHALY which can be picked up by 10-12 weeks with USG. The most specific indicator for Neural tube defects is the acetylcholinesterase
Neural tube defects
Downs syndrome
Thalassemia
noonan syndrome
Intra Uterine Growth Restriction, Intrapaum and Antepaum Fetal Surviellance