My wife is 21 weeks pregnant and had a 4D ultrasound and the doctor said the length of the nasal bone could not be observed. Doctor, could you tell me why the ultrasound of a 21-week-old fetus could not show the length of the nasal bone? Is it possible that the baby is not in the right position so the length of the nasal bone cannot be observed, doctor? I look forward to your advice, thank you.

Prenatal diagnostic tests are tests that help doctors know for sure whether the fetus has genetic abnormalities and infections. Usually these tests are based on amniocentesis and chorionic villus sampling. After having the results of prenatal genetic diagnosis, parents can decide to terminate the pregnancy or consult a doctor.

Congenital defects in the fetus are always a nightmare for mothers. Any fetus can have congenital defects at different levels, so early detection of fetal defects is very important. Currently, fetal ultrasound is one of the most effective and safest methods to detect fetal defects, even very early.