The best time for non-invasive DNA testing is between 12-22⁺⁶ weeks of pregnancy.
Non-invasive DNA testing is done by drawing maternal blood and detecting free DNA fragments of fetal origin in the plasma of the pregnant woman. The risk of chromosomal abnormalities in the fetus is assessed through the molecular genetics technique of gene sequencing.
Because this technique only requires the collection of the pregnant woman’s blood, there is no damage to the fetus. The optimal time for noninvasive DNA testing is between 12 and 22⁺⁶ weeks of pregnancy; pregnancy weeks outside of this period can have an impact on the accuracy of the screening.
Non-invasive DNA testing needs to be done with indications. If the following indications are present during pregnancy, non-invasive testing can be considered, such as pregnant women aged >35 years, abnormalities shown by the Down screening, increased fetal NT, pregnant women who have given birth to chromosomally abnormal pregnancies, those with chromosomal abnormalities on one side of the couple, etc., or those who are not suitable for invasive testing such as those who have placenta praevia and low amniotic fluid.
For non-invasive DNA test, it is recommended to go to a regular hospital and perform non-invasive DNA test under the guidance of a doctor.