Nuchal Translucency scheduled

So I finally managed to get this scheduled and I go to the hospital on the 28th.  This is the test that is run to check for chromosomal abnormalities such as down syndrome.  The test measures the clear space in the tissue at the back of the baby's neck.  Babies with abnormalities tend to accumulate more fluid there during the first trimester.  The nuchal test is less accurate than the amniocentesis test where they draw actual amniotic fluid from the sacs but it is also less dangerous since there will be only a scan and bloodwork.  The only downside I see to going the safe route is that amniocentesis actually shows the baby's chromosomal gene strand so I would have been able to know for sure what the sex of the babies are, however they only really do that test for people who are at high risk for chromosomal defects.