![]() Second Trimester Screening (the quad screen).First Trimester Screening (the nuchal translucency test).My goal is to take a nondirective approach of explaining the commonly available prenatal screening options. In discussing these testing options I am not advocating for or protesting against the issue of abortion. Other women may use the information to guide decisions such as termination and adoption. Many women like to have the information provided by these tests to prepare for when the baby is born. Certainly there are women who choose not to have any prenatal screening done. Prenatal screening for chromosome abnormalities should be made available to all women during all pregnancies (as recommended by the American Congress of Obstetricians and Gynecologists). It is important to remember that all of the following are OPTIONAL during a pregnancy. Below is a review the common prenatal screening options that are available along with the pertinent limitations and benefits of each. It can be difficult to understand all of the options and decide what is best for you. With advancing technology, the available options are becoming overwhelming for both health care professionals and patients. If the revised gestational age is 13.9 weeks gestation, we cannot calculate new risks and a more accurate risk assessment cannot be provided.Prenatal screening for genetic conditions has become a complex process with a multitude of tests to choose from. If the revised gestational age is between 10.0 to 13.9 weeks’ gestation, we can calculate and report new risks. If you want to change the EDD/gestational age used for a specific patient’s screening test, please contact your local Quest Diagnostics laboratory or call Quest Genomics Client Services at 866-GENE-INFO. If the gestational age used for screening is outside the ultrasound EDD range, it may be appropriate to change the gestational age used for screening. If a first trimester ultrasound EDD is available and the gestational age used for screening is within the EDD ☗ days, the gestational age should not be changed for screening purposes. For example, accuracy of an ultrasound EDD is ☗ days in the first trimester and ☑0 days in the second trimester. Accuracy decreases with advancing gestational age. 2 An ultrasound derived EDD is most accurate when determined in the first trimester. The earliest EDD calculated by ultrasound should be used for dating purposes. In case of a positive screen for trisomy 18, however, guidelines recommend against changing the gestational age or EDD ( see Question 3). It is appropriate to change the gestational age or EDD when the data used for screening are substantially above or below that determined by ultrasound. ![]() Guidelines recommend against repeating this test when the result is high risk for Down syndrome. Such counseling may include a discussion of the significance of the screening results and diagnostic testing options (eg, chorionic villus or amniocentesis testing) and/or noninvasive prenatal screening (NIPS test code 92777 or 91933 ). Guidelines recommend counseling women with a positive screening test. If you want to change the EDD/gestational age used for a specific patient’s screening test, please contact your local Quest Diagnostics laboratory or callQuest Genomics Client Services at 866-GENE-INFO. If a first trimester ultrasound estimated date of delivery (EDD) is available and the gestational age used for screening is within the EDD ☗ days, the gestational age should not be changed for screening purposes. Ultrasound confirmation of gestational age is recommended. Please check the demographic information to ensure accuracy of calculated results. The demographic information provided at the time of testing is used in calculating the patient’s Down syndrome risk. A High risk for Down syndrome result means there is an increased risk for the fetus to be affected with Down syndrome or other chromosome abnormality.
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