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Chorionic villus sampling (CVS) is only offered to pregnant women at higher risk of having a baby with a genetic or chromosomal condition. It can diagnose a range of conditions.
It's offered if your test results or medical or family history suggest you have a higher chance of having a baby with a genetic or chromosomal condition.
You don't have to have the test if it's offered – it's up to you to decide whether you want it.
CVS can be used to diagnose a number of conditions, including:
If you're offered CVS, ask your doctor or midwife what the procedure involves and what the risks and benefits are before deciding whether to have it.
You may also find it helpful to contact a support group, such as Antenatal Results and Choices (ARC). ARC is a charity that offers information, advice and support on all issues related to screening during pregnancy.
The test will usually tell you whether your baby will be born with any of the conditions that were tested for.
If no problem is found, it may be reassuring. A result showing that a condition was detected will give you plenty of time to decide how you want to proceed with your pregnancy. Read about the results of CVS for more information.
There is a 0.5-1% chance you could have a miscarriage after the procedure. You may feel this risk outweighs the potential benefits of the test. Read more about the risks of CVS.
Some women decide they don't want to know if there's a problem with their baby until later on. You may choose to have an alternative test called amniocentesis later in your pregnancy instead, or you might just want to find out when your baby is born.