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Amniocentesis

This is a diagnostic test that may be offered to women considered at high risk of having a baby with a condition such as Down’s syndrome.

The test is usually carried out after 15 weeks of pregnancy to find out for certain whether your baby actually has a certain condition or disabilities. A tiny sample of amniotic fluid is collected through a needle that is guided by an ultrasound scan. The amniotic fluid contains cells that have been shed from your baby. The cells from this sample are then sent to a laboratory where they are grown so that the baby’s chromosomes can be checked. The results from an amniocentesis usually take between two and three weeks. Unlike a screening test, an amniocentesis is an ‘invasive’ test and carries a risk of miscarriage of approximately 1% (1 in 100).

You should be given reliable, evidence-based information about the antenatal tests offered to you, and you have the right to accept or decline all tests (whether screening or diagnostic) according to your personal circumstances or preferences.

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