Patient's question:
What is a Down syndrome baby and what causes it?Doctor's answer:
Down syndrome screening is a method that involves drawing a pregnant woman's blood serum, detecting the concentration of alpha-fetoprotein (AFP) and human chorionic gonadotropin (HCG) in the maternal serum, and then calculating the risk coefficient for giving birth to a child with Down syndrome by combining the pregnant woman's estimated due date, age, weight, and gestational age at the time of blood collection. The optimal time for screening is between the 15th and 20th weeks of pregnancy. Generally, the screening results can be obtained within one week after blood collection. If the result is high-risk, there is no need to panic, as further tests such as amniocentesis and fetal chromosome analysis are required to confirm the diagnosis. Children with Down syndrome have severe intellectual disabilities, inability to care for themselves, and are often accompanied by complex cardiovascular diseases, requiring long-term care from family members, which places a significant emotional and financial burden on the family.By drawing a pregnant woman's blood serum and detecting the concentration of AFP and HCG in the maternal serum, and combining the pregnant woman's estimated due date, age, and gestational age at the time of blood collection, the risk coefficient for having a "Down syndrome child" is calculated. This method can identify 80% of Down syndrome cases. Down syndrome is also known as trisomy 21, which means that the patient has an extra chromosome in the 21st pair (while the normal number is one pair). Down syndrome screening is based on the levels of AFP and HCG in the pregnant woman's serum, combined with her age, weight, and gestational age to calculate a risk value. The cutoff value is 1/275. A result greater than this indicates a high-risk status, while a result lower than this indicates a low-risk status. The probability of having Down syndrome (DS) in the general population (under 37 years of age) is 1/750.
Down syndrome screening (DS screening) is a prenatal screening test for Down syndrome. Its purpose is to determine the risk of the fetus having Down syndrome by analyzing the pregnant woman's blood. If the DS screening results indicate a high risk of the fetus having Down syndrome, further diagnostic tests such as amniocentesis or chorionic villus sampling should be conducted. Starting from the 16th week of pregnancy, as a soon-to-be mother, it is important to undergo a crucial screening test for Down syndrome among all normal pregnant women. Down syndrome screening aims to identify children with Down syndrome. Down syndrome is a sporadic condition, so every pregnant woman has the potential to give birth to a "Down syndrome child."