Genetic testing of foetus

Various pre-natal genetic tests are available to screen for abnormalities such as Down ’s syndrome. Tests include ultrasound screening, chorionic villus sampling and amniocentesis.

The aim of these tests is to diagnose abnormalities in the womb so that in some instances the foetus/mother can be treated, or so the mother has the option of termination, or so the mother can prepare herself.

You should receive special genetic counselling to help you make decisions about which tests you’d like performed, as each has a rate of ‘false positives’ (suggesting abnormalities where none exist), and there is a risk to your foetus with the invasive tests – both the risk of miscarriage, which all women face with these tests, plus an increased risk of HIV transmission.

Genetic testing can increase stress and anxiety for some women, and reduce it for others so it needs careful consideration.