Ms. Van Anh and Mr. Ngoc Tuan (28 years old, Hanoi ) have been married for many years but have no children. At a class reunion after 5 years of graduation, she met her ex-boyfriend. At the time, she was sad about the fact that her husband and wife could not have children, and with the alcohol in her system, she "crossed the line" with her ex-boyfriend.
Not long after, she became pregnant and, worried about who the child was, called the genetic testing center for help.
She was advised by a specialist that in order to determine the bloodline, she needed to take a venous blood sample from the wife and a DNA test sample from the husband, including one of the following samples: Whole blood sample, oral mucosa sample (5-7 cotton swabs, let dry for 3-5 minutes then put in a clean bag), hair with roots or fingernails.
While her husband was fast asleep, she secretly took a hair sample with roots, preserved it, and then brought it to the testing center. At that time, she was only 10 weeks pregnant.
The specialist took 7-10 ml of her venous blood, used sequencing technology, analyzed the free fetal DNA in the mother's blood, extracted the DNA, multiplied it, then put it into the gene sequencing system, and compared it with the husband's DNA sample.
The test results showed that the baby in her womb was of the same bloodline as her husband. Ms. Van Anh felt relieved but also regretted betraying her husband.
Medicine has two methods of fetal DNA testing: invasive and non-invasive. (Illustration photo)
Colonel Ha Quoc Khanh, senior advisor of a testing company in Hanoi, said that the two methods of fetal DNA testing are invasive and non-invasive.
Non-invasive fetal DNA testing can be performed as early as the 7th week of pregnancy, with 99.9% accuracy. The fetal DNA will be determined from a mother's blood sample, then compared with the DNA of the alleged father. Results are available in about 10 days.
The advantage of this method is that it is easy to collect samples, reduces pain because it does not require chorionic villus sampling or amniocentesis, and is safe for both the fetus and the mother.
Invasive fetal DNA testing uses amniotic fluid or chorionic villus samples for analysis. With this method, pregnant women need the support of a specialist to ensure the safety of the fetus.
Due to the process of reabsorption of amniotic fluid through the digestive system, skin, umbilical cord and amniotic membrane of the fetus, the amniotic fluid contains fetal DNA cells. When the amniotic fluid is sent to a medical facility, a technician will extract the child's DNA for analysis. The appropriate time for amniocentesis is between 16 and 22 weeks of pregnancy.
“Any amniocentesis test requires a doctor’s consultation because this method has many potential risks. The time to receive results for invasive DNA testing is from 4 hours to 3 days,” experts recommend.
DNA testing is the analysis of individual DNA samples to find out each person's genetic data. From there, compare and determine whether individuals in question have a real blood relationship with each other.
DNA testing is not only meaningful for individuals in identifying relatives and bloodlines. This work also helps to fully implement the rights and obligations of an individual or organization, such as DNA testing for naturalization, visa, DNA testing for birth certificates, determining custody and child support rights, DNA testing for property division and inheritance rights.
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