Gynaecology & Obstetrics The best period of gestation to carry out chorion villous biopsy for prenatal diagnosis is? A 8-10 weeks B 10-12 weeks C 12-14 weeks D 14-16 weeks 💡 Explanation The best period of gestation to carry out chorion villous biopsy for prenatal diagnosis is? ✓ Correct Answer: B. 10-12 weeks