Wednesday, 21 November 2018

Prenatal Cell-Free DNA Screening (cfDNA Screening)

Prenatal Cell-Free DNA Screening (cfDNA Screening)
13 Aug
8:59

Prenatal cell-free DNA screening (also known as cfDNA screening) is an optional prenatal blood test that screens for certain genetic conditions It can be performed as early as 10 weeks of pregnancy

cfDNA screening goes by many different names including Noninvasive Prenatal Testing (NIPT) or Noninvasive Prenatal Screening (NIPS) You may have heard it referred to as the new gender test, or be familiar with specific test brand names Our blood contains fragments of our DNA-known as cell-free DNA When a woman is pregnant, her blood also contains DNA fragments from the placenta, that has a genetic make-up that is usually identical to that of the developing baby By analyzing this DNA in mom's blood, it can be determined if there is an increased or decreased chance for certain genetic conditions in the baby

Though it began as a screening for Down Syndrome, over time the list of conditions that can be screened for has grown Not all cfDNA companies screen for the same conditions These conditions are all very different from one another It is not always possible to know before a child is born how much their health will be affected It is important to know that cfDNA screening cannot detect all genetic conditions or birth defects

No test can guarantee the birth of a healthy baby Prenatal cfDNA screening is a screening test that can determine if the chance of certain genetic conditions in a pregnancy is higher or lower Since cfDNA screening is not a diagnostic test, it cannot give you "yes" or "no" answers If a result indicates ahigh or increased chance, then a diagnostic test such as amniocentesis can be performed, if desired, to determine whether the baby really has the condition or not If the results indicate a low or decreased chance, the possibility the baby has the genetic condition is lower, but not zero

cfDNA screening has been shown to be more predictive for Down syndrome compared to other screening tests such as maternal serum screening However, similarto maternal serum screening, it is possible to have a cfDNA result indicating a higher chance of a genetic condition even though the condition is not present in the baby cfDNA screening is performed on a sample of a pregnant woman's blood While there is no risk for pregnancy complications such as miscarriage, it is important to think about what these test results may mean for you Most of the time the test will come back with a low chance for a genetic condition and many women feel relief based on these results

However, if the test indicates a higherchance of a genetic condition it may create worry and uncertainty about what to do next cfDNA screening has some benefits and drawbacks when compared to other screening tests such as maternal serum screening Decisions about genetic testing in your pregnancy should be based on your own beliefs, values, needs and personality See our video, How to Decide About Prenatal Genetic Testing, as you consider your prenatal testing options

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