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|Fri, 09-20-2013 - 9:19am|
Nuchal Translucency Test
Around 11-13 weeks of the pregnancy a screening for Down’s syndrome is usually offered to all pregnant women. The test is known as the “first trimester screen” or nuchal translucency test.
This test consists of two parts:
- An ultrasound to measure the thickness of the back of the fetus’ neck and
- A blood test that detects the presence of 2 markers in a blood sample in conjunction wit blood tests that measure levels of pregnancy-associated plasma protein-A (PAPP-A) and a hormone known as human chorionic gonadotropin (HCG).
These three tests are then combined to calculate the risks of having a fetus with a chromosomal anomaly. Abnormal levels of PAPP-A and HCG or an abnormally thick neck may indicate a problem with the baby. If the test shows an increased risk, additional tests such as CVS (chorionic villi sampling) or amniocentesis can be done to confirm a diagnosis.
The current nuchal screening test has a false positive rate (that is, the results suggest a problem when the fetus is in fact healthy) of around 3-4%.
This means many women have invasive testing, using chorionic villus sampling (CVS) or amniocentesis. Both of these procedures carry a less than 1 in 2-500 risk of causing a miscarriage.
Read more here- https://www.rosiepope.com/blog/prenatal-test/
Are you planning to have the NT test done??