What does Dunn's son mean?

Down syndrome, or three body 2 1- syndrome, also known as congenital stupidity or Down syndrome, is a disease caused by chromosome abnormality (an extra chromosome 2 1). 60% of the children miscarried in the early fetus, and the survivors had obvious mental retardation, special face, growth and development obstacles and multiple deformities.

Down syndrome is caused by chromosome abnormality. Modern medicine has confirmed that the incidence of Down syndrome is related to the pregnant age of the mother, and it is an abnormality of chromosome 2 1, which has three types: trisomy, translocation and chimerism. Older pregnant women and aging eggs are important reasons for not separating.

Extended data:

Inspection method

According to the birth rate, a Down's child is born every 20 minutes on average in China, which has caused a heavy burden to the family and society. The Ministry of Health stipulates that all expectant mothers should be screened for Down's syndrome between/0/4 weeks of pregnancy/0/9 weeks of pregnancy. Expectant mothers who meet the following conditions should have Down's examination on time: close relatives are married, over 35 years old, have given birth to children with chromosomal abnormalities, and have had many spontaneous abortions or stillbirths.

Prenatal screening

For many years, pregnant women over 35 years old have been regarded as the high-risk group for prenatal diagnosis of Down syndrome at home and abroad. Under the influence of environmental pollution and bad living habits, even normal pregnant women without any abnormal family history may still give birth to Down's children. The screening results in recent years show that the number of Down's babies born to pregnant women over 35 years old accounts for 65438 0.5% of their total births. Prenatal screening of Down's babies is the key to prevent Down's babies from being born.

Risk index

The best time for screening is pregnancy 15~20 weeks. Generally, pregnant women can get the screening results within one week after blood drawing. If the result is high risk, there is no need to panic, because further amniocentesis and fetal chromosome examination are needed to make a definite diagnosis.

Down's screening is not an absolute value, but a possibility, that is, the risk of giving birth to a Down's baby. Therefore, it is not absolutely guaranteed that the fetus after screening will be 100% healthy. Down's screening is the most advanced and reliable screening method.

Baidu Encyclopedia-Down Syndrome

Baidu Encyclopedia-Screening of Down's Children