Doctors determine defective genes to help them diagnose health conditions that one is likely to develop by taking the person through genetic testing. In this test, samples of tissues of fluid from the body are examined by the doctors.
Genetic testing (amniocentesis or chorionic villus sampling) that is conducted on a 15 to 20 weeks expectant mothers is a blood test that determines genetic disorders that may affect the unborn baby. Doctors find out the possible genetic complications that may affect the baby and its gender by testing amniotic fluid that is around it which is drawn by inserting a hollow syringe in the abdomen of the mother to siphon the fluid.
When doctors find out that the fetus might not survive full-term development they perform amniocentesis to determine how mature the lungs of the fetus are to prepare for premature birth, but they are cautious because the procedure can provoke a miscarriage. The fetus is taken through a genetic test when the mother is 10 to 12 weeks pregnant chorionic villus sampling whereby a small piece of the placenta is taken out for testing. The procedure can also induce a miscarriage. Why do doctors recommend a genetic test?
A lady who has experienced two or more miscarriages needs a genetic test. There is a high chance of a miscarriage if the fetus develops specific chromosome problems.
Doctors advice older parents to get their genes tested because most of them give birth to children who have genetic health conditions.New dominant gene mutations affect children who are born of older fathers more than those who have younger fathers. A child born of a woman who is 34 years and above is a high risk of getting defective genes from the mother and develop a chromosomal problem.
It is compulsory for a woman who has delivered a stillborn child who has physical signs of a genetic illness to get a genetic test. Some babies are born alive, but they have severe birth defects hence the mother is taken through a genetic test although there are other causes of birth defects like poison or toxic substances, physical trauma or infection before delivery.
Doctors have to find out whether a parent (who has a relative suffering from a genetic illness) is a carrier of the genetic illness or not. The doctors will ensure that the baby is born free of the genetic disease. The child can get the recessive gene which is a gene that does not make the parent have the signs and symptoms of the disease. There will be no signs and symptoms of the disease from the child who gets the recessive gene and a normal dominant gene from the other parent, but its children may get the recessive gene in future.