Chorionic villus sampling preparation
Informed by recognized medical guidance
Overview
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 can detect conditions like Down syndrome, cystic fibrosis, and sickle cell disease.
- It is an invasive test with a small risk of miscarriage (about 1 in 100).
- Results are usually available in 1 to 2 weeks.
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.
Symptoms
- Heavy vaginal bleeding after the procedure
- Severe abdominal pain
- Fever or chills
- ⚠Mild cramping or spotting that worries you
- ⚠Leaking of fluid from the vagina
Common symptoms
- CVS does not diagnose symptoms; it detects genetic conditions that may not cause visible signs during pregnancy.
Symptoms in children
- CVS is not performed on children; it is a prenatal test.
Symptoms in older adults
- Not applicable for this test.
Causes
Main causes
- Advanced maternal age (35 or older)
- A family history of genetic disorders
- A previous pregnancy with a genetic condition
- Abnormal results from other prenatal screening tests
Risk factors
- The procedure carries a small risk of miscarriage (about 1 in 100).
- Rare risks include infection, bleeding, or rupture of the membranes.
When to see a doctor
See a doctor urgently if:
- If you experience heavy bleeding, severe pain, or fever after CVS, seek medical help immediately.
Book a routine appointment if:
- Talk to your doctor early in pregnancy if you think you might be at higher risk for genetic conditions.
- Ask for a referral to a genetic counselor to understand your options.
Diagnosis
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.
Tests that may be done
- Ultrasound to guide the procedure and check the baby's position
- Genetic analysis of the placental cells (karyotyping or other tests)
What to expect at your appointment
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.
Treatment
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.
Self-care at home
- Rest for the remainder of the day after the procedure.
- Avoid vigorous exercise, lifting heavy objects, or sex for at least 24 hours.
- Contact your healthcare provider if you have any unusual symptoms.
Medical treatments
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.
When is surgery considered?
Not applicable for CVS preparation.
Living with this condition
While waiting for results, try to stay relaxed and lean on your support network. It is normal to feel anxious.
Lifestyle tips
- Avoid smoking and alcohol during pregnancy.
- Eat a balanced diet rich in fruits, vegetables, and whole grains.
- Stay moderately active, but take it easy after the procedure.
Diet and exercise
Eat nutritious foods and stay hydrated. Gentle exercise like walking is fine, but rest after CVS.
Mental health and emotional wellbeing
Waiting for genetic results can be stressful. Speak to your partner, a counselor, or a support group if you feel overwhelmed.
Prevention
CVS does not prevent genetic conditions; it only identifies them. Most genetic conditions cannot be prevented, but knowing early helps families prepare.
Vaccines
Not applicable
Screening programmes
CVS is a diagnostic test. Before having it, you may be offered screening tests like ultrasound and blood tests to assess your risk.
Complications
If left untreated
- Miscarriage (the main risk of the procedure itself)
- Infection or bleeding at the sample site
- Rh sensitization in Rh-negative women (which can be prevented with a shot)
Long-term outlook
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.
Find support
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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.
Related conditions
Sources and guidance
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 16, 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.
Guidance may differ by country or region. Confirm local recommendations with a qualified healthcare provider.