It includes two blood draws and an ultrasound. The test has a narrow window for testing (the first step must be performed between 10 and 13 weeks gestation). Sequential Screening with Nuchal Translucency: This is a two-step test to detect whether a fetus is at increased risk for trisomy 21, trisomy 18, and open neural tube defects. If you elect this test, you will also have an AFP (alpha-fetoprotein) blood test to test for open neural tube defects. Recommended follow up to a positive result is genetic counseling and prenatal diagnosis. This test can be performed at any time after 10 weeks gestation. The test analyzes the relative amount of 21, 18, 13, X and Y chromosome material in circulating cell-free DNA from a maternal blood sample. The test also offers an optional analysis for fetal sex. NIPT (Non-Invasive Prenatal Testing or Cell Free- Fetal DNA): This is a simple and accurate non-invasive prenatal screening blood test that offers results for early risk assessment of Down Syndrome (Trisomy 21), or Trisomy 18 and other aneuploidy conditions. You may choose one of the following options: Trisomy 21 (Down Syndrome), Trisomy 18, and Open Neural Tube Defects (Spina Bifida). Guide to Genetic Testing Aneuploidy Testing
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