![]() ![]() An active cervical or vaginal infection, such as herpes.Your health care provider might caution against transcervical chorionic villus sampling - which is done through the vagina - if you have: If neural tube defects are a concern, an ultrasound or genetic amniocentesis might be recommended instead. In addition to identifying Down syndrome, chorionic villus sampling can be used to diagnose many other genetic conditions - including single gene disorders such as Tay-Sachs and cystic fibrosis.Ĭhorionic villus sampling can't detect certain birth defects, such as neural tube defects. You have a family history of a specific genetic condition, or you or your partner is a known carrier of a genetic condition.Babies born to women 35 and older have a higher risk of chromosomal conditions, such as Down syndrome. If a previous pregnancy was affected by Down syndrome or another chromosomal condition, this pregnancy may be at a slightly higher risk, too. You had a chromosomal condition in a previous pregnancy.If the results of a screening test - such as the first trimester screen or prenatal cell-free DNA screening - are positive or worrisome, you might opt for chorionic villus sampling to confirm or rule out a diagnosis. You had positive results from a prenatal screening test. ![]() You might consider chorionic villus sampling if: Generally, chorionic villus sampling is offered when the test results might have a significant impact on the management of the pregnancy or your desire to continue the pregnancy.Ĭhorionic villus sampling is usually done between weeks 11 and 14 of pregnancy - earlier than other prenatal diagnostic tests, such as amniocentesis. Chorionic villus sampling can provide information about your baby's genetic makeup. ![]()
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