Genetic testing helps to identify health problems in the developing fetus. Some tests are screening tests, meaning they can reveal the possibility of a problem. Others are diagnostic tests, which determines with certainty whether a problem exists.
First trimester screening (done at 11-14 weeks): a maternal blood test for 2 pregnancy hormones plus an ultrasound measurement of the thickness behind the fetal neck
Quad screening (done at 15-20 weeks): a maternal blood test for 4 pregnancy hormones
Cell free DNA testing (done after 9 weeks): identifies fetal DNA in maternal blood to see if there are extra or missing chromosomes
Chorionic villus sampling (done at 10-14 weeks): a piece of placental tissue is removed abdominally or vaginally and the fetal chromosomes are analyzed
Amniocentesis (done at 15-20 weeks): amniotic fluid is removed abdominally and the fetal chromosomes are analyzed
All women can have the first trimester and quad screening test. The other tests – cell free DNA, CVS, and amniocentesis – are reserved for women over age 35 or those with a history of genetic abnormalities. You should talk to your doctor early in the pregnancy about which tests may be right for you.
Dr. Allison Hill
1245 Wilshire Blvd.
Los Angeles, CA 90017
Phone: (213) 977-4190
Fax: (213) 250-4847
Dr. Yvonne Bohn
2001 Santa Monica Blvd
Santa Monica, CA. 90404
Phone: (310) 829-7878