This is a diagnostic test that can confirm if your baby is developing normally.

It is normally carried out at about 16 weeks of pregnancy. You may be offered the test if:

1. results from an earlier screening tests show a high risk of your baby having a problem, or
2. you have a family history of genetic problems

What is amniocentesis?

It is a diagnostic test done mainly for Down’s syndrome but can also detect other rare chromosome conditions. It involves taking a sample of the amniotic fluid that surrounds your baby.

How is it carried out?

If you have the test, a needle will be inserted through the wall of your abdomen. The needle is guided by direct ultrasound control, to make sure it does not harm the baby.

A small amount of amniotic fluid is taken using a syringe. After the test, a doctor will check your baby’s heartbeat, using the ultrasound machine, to make sure all is well. You should rest for 24 hours.

The amniotic fluid contains cells that come from the baby, these cells can be cultured for some of your baby’s chromosomes, so the test can tell you for certain whether your baby has a chromosome problem, such as Down’s syndrome.

The results for Down’s syndrome can come through in a couple of days, but results for other genetic abnormalities will take about 17 days.

Are there any risks?

There is a small risk that the procedure could cause miscarriage – about one in 100.

What next?

You may feel very relieved, but some parents have results that are worrying. It’s very important to talk these results through with your midwife or doctor.

You may want to go away and talk with your family, your spiritual adviser or just have some time alone. It’s not often that you have to make an instant decision. Take the time you need and ask for the help you need.

There are support organisations you can talk with as well. ARC – Antenatal Results and Choices -provides support for parents going through antenatal testing.

If your baby has Down’s syndrome, you can choose whether or not to continue with the pregnancy and prepare for the arrival of this special baby. Contact the Down’s Syndrome Association.