The best period of gestation to carry out chorion villus biopsy for prenatal diagnosis is: (LQ)
|A||8 to 10 weeks|
|B||10 to 12 weeks|
|C||12 to 14 weeks|
|D||14 to 16 weeks|
10 to 12 weeks
a. Chorionic villus sampling (CVS): A sample of placental tissue is obtained via catheter placed under ultrasonic guidance either trans cervically or transabdominally.
b. Performed at 10 to 12 weeks gestation, CVS provides the 'earliest possible detection of a genetically abnormal fetus through analysis of trophoblast cells.