difference in cost sequential testing nt

#Difference in cost sequential testing nt plus

Down syndrome is the most common chromosomal abnormality babies are born with. But with certain chromosomal abnormalities, the baby may survive and be born with developmental problems and birth defects that can range from mild to severe.ĭown syndrome, also known as trisomy 21, happens when a baby has an extra copy of chromosome 21 in some or all of his cells. Often, a woman who conceives a baby with an abnormal number of chromosomes will miscarry, usually early in pregnancy. This chromosomal abnormality is called trisomy.

#Difference in cost sequential testing nt plus

For example, some babies develop with 47 chromosomes: Instead of 23 matched pairs, they have 22 pairs plus one set of three. Most people have 46 chromosomes in each cell, with one set of 23 coming from the mother's egg and the other set from the father's sperm.īiological errors can happen during the early stages of cell division, causing abnormalities in the chromosomes. What's a chromosomal abnormality?Ĭhromosomes are threadlike structures in each cell that carry genes. The results can help you decide whether to have invasive diagnostic testing, such as CVS or amniocentesis, to find out for sure about your baby's condition.

Screening tests help you assess your baby's chances of having this kind of condition. Many parents-to-be worry that their developing baby may have Down syndrome or some other chromosomal abnormality. Why should I consider screening for Down syndrome?