Prenatal diagnosis at 16 weeks of pregnancy can be performed using all of the following, except:: (A) Amniotic fluid, (B) Maternal blood, (C) Chorionic villi, (D) Fetal blood
Answer is D. All options given in the question are correct as all of them are used for prenatal diangosis.
But, read the question very carefully. It specifically says at “16 weeks of pregnancy”.
Cordocentesis in is done at 18–20 weeks therefore we cannot include fetal blood in this answer.