![]() Knowing this, I decided my first step would be a noninvasive screening test. But they also come with a risk of miscarriage. Unlike screening tests, the amniocentesis and CVS don't simply assess risk but tell you for certain if your baby has chromosomal problems. She also discusses the amniocentesis and chorionic villus sampling (CVS) diagnostic tests. Oster compares the new NIPT screening test with the more traditional "integrated screening test," which combines a first trimester nuchal translucency ultrasound and blood test with a second trimester blood test to assess risk. I found the section on genetic testing to be a great introduction to all my options. Using her background as an academic researcher in economics, Oster analyzes studies on everything from coffee to deli meat into easy to understand suggestions for pregnant women backed up by data. I first found out about the NIPT by reading Emily Oster's book Expecting Better. All of the final results take five to seven days. If no Y chromosome is found, the test can tell you with high certainty that you're having a girl. If it picks up any Y chromosomes, it must be a boy since we know moms have none. The test can also determine the sex of your baby. For example, if there are too many chromosomes 21 in the blood, that suggests a high risk of Down Syndrome, which is caused by the presence of three copies chromosome 21 instead of the typical two copies. Once blood is drawn and sent to a lab, they look for an imbalance of chromosome that may signal a problem. At 10 weeks, there is enough fetal DNA to analyze. Here's an overview of how it works: while you're pregnant, some of your fetus's DNA enters into your blood.
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