For some women, there may be a question about the paternity of the baby. If this is the case, you may want to find out as quickly as possible. There is less risk to the baby if you wait until he or she is born. Unless there is an extreme situation that must be resolved immediately, it’s best for your baby to wait and take a blood sample after the birth.
The two tests used to determine paternity during pregnancy are the amniocentesis and the chorionic villus sampling (CVS) test. amniocentesis can be done between 14 and 20 weeks. The test involves using an ultrasound to locate a pocket of amniotic fluid and using needle to take a sample of this fluid. The baby’s DNA is in this fluid and can be used to determine paternity.
The CVS test involves taking a sample of the chorionic villi. These cells will develop into the placenta. The cells contain the baby’s DNA. This test can be done earlier than an amniocentesis, starting at 10 weeks.
Both tests are considered invasive and pose some degree of risk to the baby. The main risk is miscarriage. The risk depends on the type of testing you have done. For this reason, most doctors will encourage parents to wait until after the baby is born to determine paternity.
The sample will then be taken to a lab that specializes in paternity testing. Look for a lab that is accredited by the American Association of Blood Banks, for greatest reliability. The results usually take about two weeks from the date of the testing.
Most labs will require a doctor’s authorization before conducting an amniocentesis or chorionic villus sampling for the sole purpose of determining paternity. In addition, some doctors will withhold authorization due to the increased risk of miscarriage. Discuss the procedures with your physician before considering either test.
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