Patient's question:
What are the normal test results for Down syndrome? Thank you. The help you care about: Down syndrome test resultsDoctor's answer:
Down syndrome, also known as 21-trisomy syndrome or congenital idiocy, is a disease caused by a chromosomal abnormality (having an extra 21 chromosome). Currently, the most commonly used prenatal diagnostic technique is amniocentesis, which involves inserting a needle through the mother's abdomen under ultrasound guidance to extract amniotic fluid, and then performing chromosome analysis, karyotyping, and FISH technology on fetal cells. Although the characteristic facial features, hand characteristics, and intellectual impairment of this disease can provide important clues for clinical diagnosis, they are not sufficient for a definitive diagnosis.