Optimal time for chorionic villus sampling

Chorionic villus sampling is a kind of examination method that pregnant women need. Pregnant women should arrange it reasonably and go for the examination at a more appropriate time. The best time should be around ten to twelve weeks after pregnancy. The effect of the examination is very good. The main purpose of the examination is to ensure the health of the fetus, prevent congenital abnormalities in the fetus, prevent fetal malformations, etc.

Optimal time for chorionic villus sampling

There is a limit to the best time to perform chorionic villus sampling. Generally speaking, in medicine, chorionic villus sampling can be performed about ten to twelve weeks after a woman becomes pregnant. Its main purpose is to diagnose certain diseases in the fetus. Except for some special cases where amniotic fluid examination is required (such as amniotic fluid alpha-fetoprotein determination), chorionic villus sampling can almost replace amniocentesis. An ultrasound scan should be done before sampling to determine fetal viability, gestational age, and placental location.

Purpose of chorionic villus sampling

1. The purpose of prenatal check-up is to understand the health of the fetus and take the most appropriate measures when fetal abnormalities are found. If the fetal abnormality is caused by maternal reasons, such as gestational hypertension which may lead to growth retardation, the mother's health status will be adjusted to allow the baby's growth to return to normal track. However, some congenital abnormalities cannot be improved by adjusting the mother's condition.

2. Congenital abnormalities of the fetus can be divided into chromosomal abnormalities, gene abnormalities, structural abnormalities and fetal abnormalities caused by other external factors. The most well-known of these is Down syndrome, which is a chromosomal abnormality. In addition, sex chromosome abnormalities are also common, and common genetic abnormalities include favism and hemophilia. Structural abnormalities refer to structural abnormalities that can be seen from the outside, such as omphalocele, cleft lip, or incomplete limbs. Structural abnormalities are usually accompanied by chromosomal and genetic abnormalities. Therefore, doctors sometimes infer possible chromosomal abnormalities based on the observed structural abnormalities.

3. The high-risk group for fetal abnormalities is pregnant women who are over 34 years old for their first child. This is because when women conceive after the age of 34, the chance of chromosome translocation during fertilization is higher, thus increasing the chance of fetal abnormalities. In addition, those who have had fetal abnormalities or repeated miscarriages in the past are also at high risk of fetal abnormalities. Zeng Maorong, chief physician of the obstetrics and gynecology department, said that according to statistics, half of the miscarriage cases may be due to chromosomal abnormalities, which shows the truth of "survival of the fittest."

4. Purpose of examination: It can be used for cytogenetic diagnosis, gene analysis and analysis of congenital biochemical metabolic diseases. Chromosome analysis: There are direct method and culture method. Genetic analysis: can diagnose single gene genetic diseases, such as thalassemia. 3. Biochemical analysis: There are direct method and culture method; amniotic fluid is used to examine metabolic diseases. Examination results: can tell whether the fetus has any abnormalities. Abnormalities: If the fetus is found to have serious abnormalities, termination of pregnancy is recommended.

The above is the editor’s summary of relevant information on the best time for chorionic villus sampling. As for the content of prenatal check-up, after discovering that you are pregnant, you should go to the hospital to ask a specialist doctor which kind of prenatal check-up you should have, so that you can have an idea of ​​it. However, it should also be noted that although prenatal check-ups are important, they do not have to be regarded as the entire task during pregnancy. The editor wishes all mothers a happy pregnancy!