Chorionic villi are part of the developing placenta and, as such, are fetal cells. By obtaining some of these cells early in pregnancy, it is possible to assess the chromosomal make up of the fetus. CVS is a very similar procedure to amniocentesis, except that the amniotic sac is not entered. The test is usually done at 11-12 weeks and has been performed world-wide since 1983.
What does it involve?
Local anaesthetic is inserted into the skin of the abdominal wall. Under ultrasound guidance, a needle is inserted into the wall of the uterus and from there into the placenta. Once the needle is in the placenta, a sample of cells is removed by a syringe.
How long will it take?
The examination takes approximately 30 minutes. Chromosomal analysis takes two to three weeks to complete.
Is there any preparation?
A full bladder is not necessary for this procedure except when the uterus is tipped well back into the pelvis.
Aftercare:
It is a good idea to have a quiet day after the procedure. If you have any vaginal blood or fluid loss, you should contact your referring doctor immediately. There may also be some soreness around the needle site.
More detailed instructions will be given when you arrange your appointment.
If you have any questions, please do not hesitate to call us on:
0800 ULTRASOUND (0800 858 727) or 520 9550.
