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From £1350
incl lab fees

Prenatal paternity test

From 12 – 14 weeks and 16 weeks onwards

At a glance

Genetic sampling during pregnancy to determine the father of your child, taking samples from yourself using a CVS or amniocentesis procedure, and taking a blood sample from yourself and the potential father.

  • Confidentiality guaranteed
  • 99.99% accurate using DNA samples
  • Other genetic tests available at additional cost
  • No GP referral required
  • Procedure performed by a highly qualified fetal medicine specialist
  • Appointments available at short notice
  • Wednesday and Friday clinics
  • Convenient central London location

You will receive

  • Results in 5 working days
  • Two-page clinical report, plus  one-page of genetic results

What happens with your results?
Your results will be sent to you by mail in 5 working days in an unmarked envelope. Alternatively you may receive your results by calling the laboratory and using a pre-agreed security password.

What is it for?

A prenatal paternity test is a diagnostic genetic test to determine the father of your unborn child.

The samples are gathered using either a CVS from 12 to 14 weeks or an amniocentesis procedure from 16 weeks gestation onwards.

How does prenatal paternity testing work?

A DNA sample of the unborn child is taken from the pregnant mother by CVS or amniocentesis. At the same time a blood sample is taken from a potential father or fathers. The samples are analysed in a genetic laboratory using forensic technology to produce a result that will either include or exclude a potential father.

Legally any potential fathers participating in the test must give their written consent beforehand. If there are two potential fathers at least one must consent and participate in the test. If there are three potential fathers then at least two must participate and so on.

The sample from the mother is taken by a consultant fetal medicine specialist at the London Ultrasound Centre. Blood samples from the father(s) are taken by a certified medical professional at The Doctors Laboratory.

Once all the samples have been taken the results of the test usually take about five working days.

What if the potential father lives overseas?
You can still have a test. However, current UK legislation requires that samples are taken only by a registered medical professional, such a GP, another doctor or a practice nurse. We can send a collection kit to a nominated GP, doctor or nurse who has agreed to take the sample.

When we can’t perform the prenatal paternity test.
In 5% of patients we are unable to perform a CVS due to the position of the placenta. The only solution is to wait until at least 16 weeks gestation when an amniocentesis can be performed. If this occurs you will be charged for the professional scanning and consultation time which will be instead of the prenatal paternity testing fee.

We also don’t usually perform the test between 20 and 34 weeks gestation due to the risk of the procedure triggering premature labour.

Prenatal paternity testing for twins?

Yes it is possible, however the chances of having separate pregnancies from two different fathers are extremely rare and so testing just the one fetus is sufficient in the overwhelming majority of cases.

Also there is a higher charge for obtaining and testing an additional fetal sample for twins.


All of our staff are bound by our company’s patient confidentiality agreement.

Only the people who give samples (or their nominated solicitor) will be able to receive a copy of our report.

How accurate is the test?

Where a DNA sample has been taken from the mother, potential father(s) and the unborn child the probability of paternity is 99.99% accurate or greater.

Are there any risks?

Like any medical procedure there is a risk. With prenatal paternity testing the risk of miscarriage is 1% when the test is performed by a CVS and 0.5% when by an amniocentesis.

Can you test for anything else at the same time?

We are able to offer testing for many genetic disorders at the same time as your prenatal paternity test (additional lab fees apply), using the same samples.

For instance; you may have had a high risk result from your Down’s Syndrome screening or are simply seeking reassurance that all is well with your baby.

Find out more about our genetic screening services on our CVS or amniocentesis pages.

Legal disputes

You can have a prenatal paternity test for social or legal reasons, but please be aware that neither the London Ultrasound Centre (the fetal sample collector), nor The Doctors Laboratory (the maternal and fraternal sample collector), nor TDL Genetics (the forensic test laboratory) are willing or able to provide representation in a court of law.