Diagnostics·Diagnostics
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Chorionic villus sampling (CVS) is a prenatal test done early in pregnancy (usually between weeks 11 and 13) to check for certain genetic conditions in the baby. It involves taking a small sample of cells from the placenta.
Key facts
CVS is not a routine test. It is offered to pregnant women who have a higher chance of having a baby with a genetic condition.
Pregnant women who are at increased risk, such as those age 35 or older, those with a family history of genetic disorders, or those with abnormal ultrasound or blood test results.
CVS itself is a diagnostic test. A doctor inserts a thin needle through the abdomen (or a tube through the cervix) to collect a small piece of tissue from the placenta.
The procedure takes about 10 to 15 minutes. You may feel mild cramping. Afterward, you should rest for the day and avoid heavy lifting. Results are typically ready in 1 to 2 weeks.
If CVS finds a genetic condition, your healthcare team will offer counseling and support to help you understand the results and your options for care during and after pregnancy.
The test itself does not require treatment. If a condition is detected, your doctor will discuss possible treatments or management plans for the baby, which may involve specialists after birth.
Not applicable for CVS preparation.
While waiting for results, try to stay relaxed and lean on your support network. It is normal to feel anxious.
Eat nutritious foods and stay hydrated. Gentle exercise like walking is fine, but rest after CVS.
Waiting for genetic results can be stressful. Speak to your partner, a counselor, or a support group if you feel overwhelmed.
CVS does not prevent genetic conditions; it only identifies them. Most genetic conditions cannot be prevented, but knowing early helps families prepare.
Not applicable
CVS is a diagnostic test. Before having it, you may be offered screening tests like ultrasound and blood tests to assess your risk.
For most women, CVS provides valuable information to help you prepare for your baby's health needs. The small risk of complications is carefully managed by your healthcare team.
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Always verify with your doctor
Health guidelines vary by country and region. The information in this article is based on international clinical guidelines but may not reflect the specific guidelines, medications, or practices in your country. Always discuss your health concerns with your own doctor or healthcare provider, and refer to your local national health guidelines where available.
Important notice This information is for educational purposes only. It does not replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider about your specific situation. If you are experiencing a medical emergency, call your local emergency services immediately.
This article is educational and is prepared with reference to recognized health information and clinical guidance sources where available. Specific source links may vary by topic.
Last updated: July 9, 2026
Educational note: This information is for education only and is not a diagnosis.
Use it to support, not replace, advice from a licensed clinician.
If symptoms are severe, worsening, or urgent, call your local emergency number or seek emergency care.