![]() ![]() Department of Health and Human Services Sickle Cell Disease Diagnosis. National Heart, Lung, and Blood Institute.Mayo Foundation for Medical Education and Research c1998–2022. Seattle (WA): American Association for Clinical Chemistry c2001–2020. ![]() The Rh Factor: How It Can Affect Your Pregnancy. Washington D.C.: American College of Obstetricians and Gynecologists c2022. ![]() But if a screening test shows that your baby has a risk for certain problems, you may have amniocentesis or CVS to find out for sure. It's possible to have an abnormal screening test when your baby is actually healthy. Screening tests estimate the chances that your unborn baby may have certain problems. But it has a slightly higher risk of miscarriage.Īs you make decisions about testing, keep in mind that prenatal genetic diagnostic tests are different from screening tests. Like amniocentesis, CVS is an accurate diagnostic test that can find certain genetic disorders. You can have a CVS test between 10 and 13 weeks of pregnancy, which gives you more time to decide what to do if the results are abnormal. This test takes a small sample of tissue from the placenta In that case, you might consider another diagnostic test called a chorionic villus sampling (CVS). ![]() In some cases, you may want information about your unborn baby sooner than 15 to 20 weeks, when amniocentesis is usually done. Is there anything else I need to know about amniocentesis?
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