First-trimester screening has three parts, an ultrasound test for fetal nuchal translucency (NT), PAPP-A, and hCG. When used together, NT screening and maternal blood tests have a greater ability to determine if the fetus might have a birth defect, such as Down syndrome, Edward syndrome, or Patau syndrome. Additional testing, such as amniocentesis or other ultrasound procedures, may be necessary for accurate diagnosis if the results are abnormal.
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Overview:
First-trimester screening has three parts, an ultrasound test for fetal nuchal translucency (NT), PAPP-A, and hCG. When used together, NT screening and maternal blood tests have a greater ability to determine if the fetus might have a birth defect, such as Down syndrome, Edward syndrome, or Patau syndrome. Additional testing, such as amniocentesis or other ultrasound procedures, may be necessary for accurate diagnosis if the results are abnormal.
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