The screening test for Down's syndrome used at this stage of pregnancy is called the "combined test". It involves a blood test and measuring the fluid at the back of the baby's neck nuchal translucency with an ultrasound scan.
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This is sometimes called a nuchal translucency scan. The nuchal translucency measurement can be taken during the dating scan.
3 reasons why your due date is wrong
Find out more about the combined screening test for Down's syndrome. You won't be offered the combined screening test if your dating scan happens after 14 weeks.
Instead, you will be offered another blood test between 14 and 20 weeks of pregnancy to screen for the risk of Down's syndrome. This test is not quite as accurate as the combined test. Skip to main content.
Dating scan accuracy?!
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An early ultrasound, usually done at about 6 to 9 weeks, can give the most accurate due date estimation by measuring the size of the embryo or fetus. However, many pregnancies are confirmed by a Doppler heartbeat monitor, not an ultrasound.
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Did you get your very first ultrasound in your second trimester? If so, that could be why your due date shifted. Ultrasounds performed during the first trimester not the second give the most accurate due date predictions, according to a study in the American Journal of Obstetrics and Gynecology.
The length of this is approximately the size of your uterus and closely correlates to how far along you are. If she estimates your measurements are off by three weeks or more, in many cases she may move the due date to reflect this.
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This is often part of the quad screen. While high levels of AFP sometimes indicate a potential genetic abnormality, the number one reason is simply your due date was miscalculated. The educational health content on What To Expect is reviewed by our team of experts to be up-to-date and in line with the latest evidence-based medical information and accepted health guidelines, including the medically reviewed What to Expect books by Heidi Murkoff.
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