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Ob Quad Screen |
The Quad screen is a test of the mothers blood for hormones that come from the baby. The level of four different hormones are determined, and then calculations are made for your baby's risk of certain birth defects. The problems directly tested for are Down syndrome, spina bifida, and Trisomy 18. Trisomy 18 is a lethal chromosomal defect where there is an extra copy of chromosome 18 in the baby. Testing is offered between 15 and 20 weeks gestation. Results are usually available within 3 to 4 days.
The quad screen is a screening test which is offered to all pregnant women. It is the most commonly used and most universally available test for screening your baby for common birth defects. Not all women will be interested in testing. The quad screen is not a diagnostic test. (such as amniocentesis,chorionic villus sampling, or cordocentesis) The quad screen uses the levels of four fetal hormones in the mother's blood to calculate new and specific risks for your baby. Commonly quoted risks for birth defects are usually based only on the age of the mother at delivery. The newly determined risk will either be lower than normal, normal, or elevated. Most elevated risk results will result in the birth of a normal baby, but about 65% of Down syndrome babies, 90% of spina bifida babies, and most Trisomy 18 babies will be within the group with abnormal results.
Further testing will be offered, including referral for level II sonograms, genetic counseling, and if necessary, Amniocentesis.
Other fetal problems may result in an abnormal quad screen. Such pregnancies are considered high risk and are closely watched for growth and fetal well being.
Quad screen testing is optional and may not be for you. As a routine part of your prenatal care,we will discuss whether or not you desire testing. |
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