Paternity Test while Pregnant

By  ,  Onlymyhealth editorial team
May 10, 2013

Paternity Test while Pregnant

Paternity tests are conducted to figure out the identity of the baby’s father. These tests can be done in the form of amniocentesis and chorionic villus sampling both of which are quick, easy and painless. In the process, DNA sample is examined. The sampling procedure also examines foetus for chromosomal abnormalities and other genetic disorders.


  • The mother as well as father is provided with a sampling material, which they have to swab inside of their cheeks before sending it back to the laboratory.
  • In the procedure, the health expert inserts a thin needle into the mother’s abdomen to retrieve a fluid sample from the unborn child.
  • Sample of about two tablespoons carrying foetal cells is enough to determine the DNA and match it with the father’s DNA.
  • Amniocentesis should only be performed on the 13th and 20th week of pregnancy term.
  • A health care provider should be consulted before performing these tests, which may be risky for some women due to complications of pregnancy.

Chorionic Villus Sampling (CVS)

  • Chronic villus sampling should be done between10th and 13th week of pregnancy term.
  • To retrieve a sample of a type of placenta tissue called chorionic villi, sampling expert inserts a needle through abdomen or the cervix.
  • These tissues have the same DNA as the foetus because of which it can be used for paternity testing.
  • As procedure is guided by the ultrasound, risk of damage to the foetus and placenta is minimal.

Risk Aspects of Paternity Tests

  • Both the paternity tests are reliable, but they do carry the risk of miscarriage the chances of which are identified to be between one in 300 and one in 500.
  • The risk becomes slightly more if the needle goes in through the cervix rather than the abdominal wall.
  • Infections, cramping and vaginal bleeding may also occur post the paternity tests.
  • After undergoing paternity test, expecting mother may experience a slight discomfort such as light cramping.
  • Paternity testing isn’t a medical necessity and should be done if there is a suspicion of genetic and chromosomal disorders.

Non-invasive Paternity Testing

Non-invasive paternity testing is considered a risk-free method for conducting paternity test. In this test, foetal DNA is merged with the mother's blood stream via the wall of the placenta. The method doesn’t have complications such as leakage of amniotic fluid.


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