Depending on the type of test, a sample of your blood, skin, amniotic fluid or other tissue will be collected and sent to a lab for analysis.
- Blood sample. A member of your health care team takes the sample by inserting a needle into a vein in your arm. For newborn screening tests, a blood sample is taken by pricking your baby's heel.
- Cheek swab. For some tests, a swab sample from the inside of your cheek is collected for genetic testing.
- Amniocentesis. In this prenatal genetic test, your doctor inserts a thin, hollow needle through your abdominal wall and into your uterus to collect a small amount of amniotic fluid for testing.
- Chorionic villus sampling. For this prenatal genetic test, your doctor takes a tissue sample from the placenta. Depending on your situation, the sample may be taken with a tube (catheter) through your cervix or through your abdominal wall and uterus using a thin needle.
Aug. 09, 2017
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- Frequently asked questions. Prenatal genetic diagnostic tests. FAQ164. Pregnancy. American College of Obstetricians and Gynecologists. https://www.acog.org/-/media/For-Patients/faq164.pdf?dmc=1&ts=20161216T1208042192. Accessed Feb. 13, 2017.
- Breast cancer risk factors you cannot change. American Cancer Society. https://www.cancer.org/cancer/breast-cancer/risk-and-prevention/breast-cancer-risk-factors-you-cannot-change.html. Accessed Feb. 21, 2017.
- Atwal PS (expert opinion). Mayo Clinic, Jacksonville, Fla. Feb. 24, 2017.