Prenatal Tests in the 2nd Trimester
In this article
Optional Screening for Birth Defects continued...
Multiple marker screening. This test is offered to all women regardless of risk. A doctor takes a sample of your blood between the 15th and 20th weeks of pregnancy. You might hear these screenings referred to as triple screen, quadruple screen, or alpha fetoprotein (AFP) test. These tests can detect defects or levels of hormones that may indicate a possible problem.
NIPT screening- “Non-invasive prenatal testing”- This test is generally offered to high risk patients. It is a blood test that looks at broken down fetal cells that are in the mother’s circulating blood to screen for Down’s Syndrome, Trisomy 18 and 13 and some sex chromosomal abnormalities. It can be done between 10-22 weeks of your pregnancy.
Amniocentesis. What if you are at increased risk or if the multiple marker screening or other factors indicate risk for a birth defect? You have the option of having an amniocentesis. This can diagnose chromosomal disorders or certain other defects. During an amniocentesis, the doctor guides a thin needle into the uterus to collect a sample of amniotic fluid for testing.
Now what? If your test results indicate risk for or an actual birth defect, you may want to consult with a genetic counselor. This person can help you understand the test results and risks, and can help you understand your options.