<unk>  <unk>  is a form of prenatal diagnosis to determine genetic abnormalities in the fetus. It entails getting a sample of the<unk><unk>  (placental tissue) and testing it. It is generally carried out only on pregnant women over the age of 35 and those whose offspring have a higher risk of Down syndrome and other chromosomal conditions.
The advantage of<unk>  is that it can be carried out 10-12 weeks after the last period, earlier than amniocentesis (which is carried out at 15-18 weeks).
Chorionic villus sampling
Amniocentesis
Karyotype
Fetal screening
Obstetric ultrasonography
HCG pregnancy strip test
Cytogenetics
Triple test