What is the difference between CVS and Amniocentesis?

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If you are reading this blog after your doctor suggested any of these two tests then there is a possibility that your screening test showed abnormal test results because usually Amniocentesis and CVS are prenatal DNA test that is prescribed by the doctor after the screening test of the fetus show abnormal results.
Although both of these tests are done to determine whether the unborn child has any risk of acquiring any kind of genetic or chromosomal defects in the unborn offspring it still differs greatly.

prenatal dna testing

Amniocentesis DNA test

•  The amniocentesis DNA test is a procedure in which a small sample of amniotic fluid is obtained from the amniotic sac for DNA testing.
•  This is the fluid that surrounds the fetus in a pregnant woman. As this fluid contains the same genetic makeup as the baby this fluid is used by doctors to determine any kind of genetic defect in the fetus like Down syndrome, patau’s syndrome, and other genes related disorders.
•  The amniocentesis DNA test is performed by injecting a thin needle into the abdomen and uterus with the help of the ultrasound. This needle extracts the sample from the uterus and then the sample is used to conduct tests.

prenatal dna testing

CVS DNA test

• Chorionic villus sampling is also known as the CVS DNA test is also a prenatal test that is used to detect birth defects like genetic diseases or potentially harmful infections in the unborn child during the pregnancy for example Tay-Sachs disease, sickle cell anemia, or cystic fibrosis.
• During this CVS DNA test, a small sample of chorionic villi is taken from the placenta through the cervix. Chorionic villi are tiny parts of the placenta that develop from a fetus, so they share the same genes as the baby.

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