What Is Chorionic Villous Sampling (CVS)?

Chorionic villous sampling (CVS) is a prenatal test done during pregnancy. It checks for certain genetic or chromosomal conditions in the baby. Doctors collect a small sample of tissue from the placenta. This tissue contains the same genetic material as the baby. Because of this, CVS can help find problems early. The CVS test during pregnancy is usually offered between 10 and 13 weeks.

Why Is CVS Performed?

Doctors use CVS to look for genetic disorders. For example, it can detect Down syndrome, cystic fibrosis, and sickle cell disease. Sometimes, parents have a higher risk of passing on certain conditions. In these cases, CVS helps provide answers sooner. Early diagnosis allows families to plan and make informed choices. According to the CDC, early testing can improve care for both mother and baby.

How Is CVS Done? (Procedure Overview)

CVS is a short procedure, usually done in a hospital or clinic. First, the doctor uses ultrasound to find the best spot. Then, they collect a small sample of placental tissue. There are two main ways to do this:

Transabdominal: A thin needle goes through the belly to the placenta.

Transcervical: A thin tube goes through the cervix to reach the placenta.

Most women feel mild discomfort, but the procedure is quick. Afterward, you can usually go home the same day. The sample goes to a lab for testing. Results are often ready in one to two weeks.

Who Should Consider CVS?

Not everyone needs CVS. However, some women may benefit from this test. You might consider CVS if:

You are over 35 years old at delivery.

You or your partner carry a genetic disorder.

You had a previous child with a genetic condition.

Your doctor finds signs of a problem on an early ultrasound.

Always talk with your doctor or a fetal medicine specialist. They can help you decide if CVS is right for you.

Benefits and Risks of CVS

CVS offers several benefits. For example, it gives early results about your baby’s health. This can help with planning and decision-making. Also, CVS can detect many conditions that other tests might miss.

However, there are some risks. The main risk is miscarriage, which happens in about 1 out of 500 cases. Other risks include infection, bleeding, or cramping. According to the World Health Organization, CVS is safe when done by trained doctors. Still, it is important to discuss CVS procedure risks with your healthcare provider.

Preparation and Aftercare

Before the CVS test, your doctor will explain the procedure. You may need to have a full bladder for the ultrasound. Wear comfortable clothes and bring someone to drive you home. After the test, rest for the day. You may have mild cramps or spotting. If you have heavy bleeding, fever, or severe pain, call your doctor right away. Most women return to normal activities within a day or two.

Frequently Asked Questions About CVS

Is CVS painful? Most women feel mild discomfort, not pain. The test is quick.

How soon will I get results? Results are usually ready in one to two weeks.

Can CVS detect all birth defects? No, CVS checks for many genetic and chromosomal conditions, but not all birth defects.

Is CVS safe? CVS is generally safe, but there is a small risk of miscarriage and infection.

Will CVS harm my baby? Most babies are not harmed by CVS, but there is a small risk of complications.

When to Consult a Fetal Medicine Specialist

If you have questions about prenatal diagnosis CVS, talk to your doctor. You should also see a fetal medicine specialist if you have risk factors or concerns about your baby’s health. They can explain the benefits and risks of CVS and help you make the best choice for your family.

For personalized advice about CVS, consult a fetal medicine specialist. They can guide you through the process and answer your questions.