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Harley Street 020 7563 4309
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Non Invasive Prenatal Testing (Harmony Test) is currently the most accurate way of screening for chromosomal conditions such as Down’s syndrome, Edwards’ syndrome or Patau’s syndrome. In some cases where this screening test has shown a “High Risk” or parents may be concerned about a known or suspected genetic condition in themselves or their family, our Fetal Medicine Specialist Consultant can offer an invasive test called an Amniocentesis or Chorionic Villous Sampling. These are invasive diagnostic tests that can give a definite answer about specific chromosome differences in babies but do involve a risk of miscarriage. However, our Fetal Medicine Specialist would counsel you in detail under these circumstances, to help you decide if these tests are appropriate for you. These invasive tests can also be used to check the Paternity of the baby.


The Harmony Test is a genetic test used to identify if your baby is likely to be born with a birth defect, most commonly Down Syndrome. Typically, it is carried out between the 12-14 week stage of pregnancy, and is done by testing the fetal cells present in the mother’s blood to see if chromosomal abnormalities are present. It is a safe, non-invasive test and therefore can not harm you or your baby.

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An Amniocentesis is a type of test that is carried out if you have been given a high risk Down Syndrome Screening result, or if any other serious problems have been detected in your baby in previous scans. It involves testing the amniotic fluid of the mother to analyse cells from the baby, and check for any chromosomal defects.

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A Chorionic Villous Sampling Test is similar to an Amniocentesis in that it can also be offered if you are given a high risk Down Syndrome Screening result. However, a CVS Test can be performed earlier than an Amniocentesis at 11-15 weeks of the pregnancy as there are fewer risks associated with it.

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Using the latest laboratory forensic technology, we are able to provide a Paternity Test result that is 99.99% accurate when a DNA sample has been taken from the mother, potential father, and the unborn baby. Participants must provide written consent in order to perform the test, and all results will be confidential and only provided to those involved in the testing process.

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Book your appointment at the LWC Pregnancy and Gynaecology clinic today. 

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