How CVS is performed
A fine needle is inserted through the maternal abdomen under continuous ultrasound guidance to sample chorionic villi (placental tissue) which share fetal genetic material. Procedure takes 5-10 minutes.
When CVS is offered
- High-risk NT combined screening
- Abnormal NIPT result requiring confirmation
- Known parental balanced chromosomal rearrangement
- Single-gene disorder testing where parents are carriers
- Specific structural fetal abnormality on first-trimester ultrasound
What to expect
Rest for 24 hours. Mild cramping is normal. Rapid PCR/FISH results in 2-3 days; full karyotype in 10-14 days.
Your fetal-medicine specialist
Your CVS is performed under continuous ultrasound guidance by a clinician dedicated to fetal medicine, with a direct pathway to senior gynaecologist Dr. Priyadatt Patel for any pregnancy that needs obstetric care.
Dr. Mayank Chaudhary
An ISUOG-trained fetal-medicine consultant who performs CVS under continuous, real-time ultrasound guidance.
Standards & further reading. Our approach aligns with the RCOG amniocentesis & CVS leaflet and the ISUOG guidelines.
Related fetal-medicine pages
NT ScanAnomaly Scan (TIFFA)Doppler ScanNIPTPrenatal GeneticsAmniocentesisCVS vs AmniocentesisFetal MedicinePregnancy Care
Frequently asked
Risks, accuracy & how we counsel before CVS
Chorionic villus sampling (CVS) samples placental tissue, usually between 11 and 14 weeks, to diagnose chromosomal and genetic conditions earlier in pregnancy than amniocentesis allows. It is offered when there is a clear indication β a high-risk screening result, an abnormality on scan, or a known familial genetic condition β not routinely.
How accurate, and its limits
CVS is highly accurate for chromosomal diagnosis. Two caveats we explain: confined placental mosaicism can occasionally give a result that reflects the placenta rather than the baby (sometimes prompting a confirmatory amniocentesis), and CVS does not detect neural-tube defects, which are followed up on the anomaly scan.
The procedure-related miscarriage risk
In experienced hands under continuous ultrasound guidance the added miscarriage risk is small β broadly comparable to amniocentesis. We give you our honest, individualised view of that risk against the value of an early diagnosis, so the decision is genuinely yours.
Alternatives
Depending on timing and indication, non-invasive prenatal testing (NIPT, a screening blood test) or a later amniocentesis may be more appropriate. CVS is chosen when an early, definitive answer matters.
Dr. Priyadatt Patel
Senior Gynecologist Β· Advanced Laparoscopic Surgeon Β· IVF and Endometriosis Programme Lead
MS OBGyn Β· Pregnancy Care Β· Advanced Gynaecological Ultrasound Β· Fertility Preservation
ESHRE / ESGE / AAGL / ASRM guideline-aligned practice. 3D Karl Storz precision technique. Fertility-preservation-first philosophy. Evidence-based decisions, honest counselling, long-term outcomes orientation.
Science City Road, Ahmedabad 380060
MonβSat 11:00β20:00 Β· +91 97234 31544
Naranpura, Ahmedabad
MonβSat 08:30β10:30 Β· +91 70460 02566
