CVS (Chorionic Villus Sampling )

CVS is a method of obtaining a sample of the placenta usually for analysis of the baby’s chromosomes and is normally performed between 11 and 14 weeks of pregnancy.

The test is done in the ultrasound room and after a full explanation of the test, the skin of the mother’s abdomen is cleaned with antiseptic fluid and an injection of local anaesthetic is given. With continuous scanning, a fine needle is passed through the mother’s abdomen into the placenta and a tiny sample of the placenta is taken. The entire procedure lasts only a few minutes and afterwards, the mother can continue with her normal activity. There is no need for bed rest.

The risk of miscarriage due to the CVS is 1-2% and if this is going to occur, it is likely to happen in the week following the CVS. Some mothers experience some period like pains or slight vaginal bleeding for 24-48 hours after the procedure but this is not a sign that the pregnancy will miscarry and paracetamol can be taken in normal doses.

The results of the CVS are usually available in 2-3 days and the best method of informing the mother of the result is arranged at the time of the CVS.