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What is Amniocentesis?
This procedure involves the examination of amniotic fluid, which surrounds the baby and contains cells shed by the baby.
How is it done?
It involves passing a fine needle through your abdomen into the uterus in order to aspirate with a syringe some of the fluid (10 mls) from around the baby. An ultrasound scan is used throughout the procedure, which takes only 1-2 minutes to perform.
When is it done?
At 16-20 weeks, although it can also be done in later pregnancy.
What should I expect after the Amniocentesis?
Most women do not find the procedure painful. Some find it uncomfortable.
How long does it take to get the results?
The preliminary results for Down's syndrome are available within 3-4 days. The full chromosome analysis takes between two and two and a half weeks.
What are the risks?
The risk of miscarrying due to the procedure is 0.5 per cent.
Will the procedure need to be repeated?
Rarely the results are inconclusive and a second procedure (such as fetal blood sampling) may need to be performed.
Why is my blood group relevant?
If your blood group is rhesus negative we will need to give you an injection of anti D following the procedure to prevent the development of rhesus disease in future pregnancies.
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