Gynaecology & Obstetrics Prenatal diagnosis at 18 – 20 weeks of pregnancy can be performed using all of the following, except: A Amniotic fluid B Maternal blood C Chorionic villus sampling D Fetal blood 💡 Explanation Prenatal diagnosis at 18 - 20 weeks of pregnancy can be performed using all of the following, except: ✓ Correct Answer: C. Chorionic villus sampling