The placenta has the function of ensuring the fetus lives, metabolizes and plays an endocrine role to help the mother's body adapt to pregnancy. Abnormalities of the placenta will clearly reflect abnormalities of the fetus.

Some prenatal screening procedures require deep penetration into the uterus to obtain tissue samples or amniotic fluid samples for testing, such as amniocentesis and chorionic villus sampling.

During the second trimester of pregnancy, when the fetus has risk factors and suspected abnormalities, to confirm more firmly, doctors will advise the mother and family to perform a chorionic villus biopsy.

DNA-free prenatal screening is a non-invasive prenatal screening method with no risk of miscarriage, with a high disease detection rate and low false positive and false negative rates compared to traditional serum screening methods.

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.

Chorionic villus sampling is a technique often prescribed by doctors to check for fetal abnormalities after fetal malformation screening tests show that the fetus is at high risk of genetic abnormalities. What is chorionic villus sampling? When is chorionic villus sampling performed? The possible risks of chorionic villus sampling and some other questions will be answered in the following article.

Chorionic villus sampling (CVS) is a procedure performed in early pregnancy to detect chromosomal abnormalities. It is performed when the mother or father of the baby has a genetic condition that runs in the family. CVS is one of the invasive tests that gives highly accurate results.

The formation of the fetus's sex will occur at the time the egg and sperm meet, according to the principle: an egg carrying the X chromosome meets a sperm carrying the X chromosome to form an XX zygote - female, and an egg carrying the X chromosome meets a sperm carrying the Y chromosome to form an XY zygote - male.

Thalassemia, also known as a hereditary hemolytic disease, causes red blood cells to break down, and the patient is constantly anemic. This disease can be prevented by screening for thalassemia and premarital examination.

If thalassemia is not treated early, many complications will appear due to anemia and excess iron in all organs, changing the appearance. Prevention of thalassemia requires understanding the genetic mechanism, then it can be completely prevented.

Chorionic villus sampling (CVS) is a commonly used interventional procedure in prenatal diagnosis, helping doctors screen for genetic abnormalities and infections in the fetus.