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Amniocentesis is a diagnostic test done during pregnancy that looks directly at genetic material from the pregnancy itself, rather than estimating risk the way a screening test does. During the procedure, a small sample of the fluid that surrounds the baby in the uterus, called amniotic fluid, is withdrawn and sent to a laboratory for testing. This fluid contains cells that have been shed from the baby, and those cells carry the same DNA as the baby, which makes it possible to look directly at the baby’s chromosomes and genes.
Amniocentesis is considered a diagnostic test, which means it gives a definitive answer, unlike screening tests such as blood tests or ultrasound measurements, which only estimate the chance that a condition is present. Professional guidelines recommend that all pregnant patients, regardless of age or background risk, be offered the choice of diagnostic testing with amniocentesis or a related procedure called chorionic villus sampling, which is done earlier in pregnancy using a small piece of placental tissue instead of fluid.
People consider amniocentesis for several different reasons, and no single reason applies to everyone:
A screening test came back higher-risk. Blood-based or cell-free DNA screening, or an ultrasound finding, suggested an increased chance of a chromosome condition, and the family wants a definitive answer rather than an estimate.
A structural difference was seen on ultrasound. When an ultrasound shows something unexpected about how an organ has formed, amniocentesis can help identify an underlying genetic cause.
A known genetic condition runs in the family. If parents are known carriers of a specific genetic change, amniocentesis can test the pregnancy for that same change.
A patient simply wants the most complete information available. Some people choose amniocentesis electively, without a specific risk factor, because they prefer definitive diagnostic information over an estimate.
The decision to pursue amniocentesis is always personal, and it is entirely acceptable to decline it. A genetic counselor can help weigh the benefits, limitations, and small risks against what a family hopes to learn.
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