Patient's question:
Many people say that having twins makes the Down syndrome screening test useless. Is this viewpoint correct?Doctor's answer:
Tang screen is the full name of "Tang syndrome screening," which is usually performed between the 16th and 20th weeks of pregnancy as a thorough examination. It refers to screening for (Down syndrome, also known as). This involves taking chorionic villus blood or amniotic fluid for cell culture, followed by karyotype analysis.Twins do not need to undergo Tang screening because it is not effective for reference, but amniocentesis can be performed for a thorough examination. If Tang screening is conducted, its accuracy is not high. Tang screening primarily involves extracting venous blood for detailed examination, integrating factors such as the mother's age and gestational week to comprehensively analyze the risk of the fetus being a child with Down syndrome.