Quick Answer: What Is A Normal Nuchal Fold Measurement At 20 Weeks?

What is an abnormal nuchal fold measurement?

ACOG defines an abnormal nuchal fold as ≥ 6mm in the 2nd trimester (typically performed between 15w0d and 22w6d).

The SOGC (Society of Obstetricians and Gynecologists of Canada) considers a nuchal fold to be abnormal when the measurement is ≥ 5 mm at 16-18 weeks, or ≥ to 6 mm at 18-24 weeks..

What does a thickened nuchal fold mean?

Abstract. Many studies have shown that a thickened nuchal fold in a second-trimester fetus is a sonographic sign suggestive of a high risk for Down syndrome. These series have included fetuses already at risk for aneuploidy because of advanced maternal age or abnormal maternal serum alpha-fetoprotein (AFP) levels.

How accurate is 12 week scan for Down’s syndrome?

How reliable are the tests? If done between 10 and 13 weeks pregnant, the blood test and ultrasound scan together will detect around 90% of babies affected with Down syndrome. If the blood test is done between 15 and 20 weeks it will identify about 75% of babies with Down syndrome.

What causes extra fluid behind neck in fetus?

In the fetus fluid collects behind the neck, much like it does in dependent ankle oedema in later life. This occurs partly because of the fetus’s tendency to lie on its back and partly because of the laxity of the skin of the neck.

Can you see abnormalities at 12 week scan?

Some major abnormalities can be visible at 12 weeks, but it is much better to have an ultrasound examination at 20 – 22 weeks as well to exclude structural abnormalities as far as possible. To assess the risks of Down’s syndrome and other chromosomal abnormalities.

What is the normal range for nuchal fold thickness?

During the routine first trimester screening at 13 weeks of gestation, NT was measured at 3 mm. The normal range of NT for this age is 1.6-2.4 mm. Nuchal skin fold (NF) measurements and prenatal follow-up ultrasound findings were normal.

How common is thickened nuchal fold?

This condition is an increased thickness of the skin at the base of a fetus’s neck. It is found via ultrasound in 1-2 percent of normal pregnancies between 15 and 20 weeks’ gestation.

Can nuchal fold measurement be wrong?

Nuchal translucency and the first trimester combined screening. Nuchal translucency screening has a relatively high rate of error when performed by itself. To improve the accuracy of results, your practitioner will likely offer what’s known as a combined screening.

What does thick neck in fetus mean?

To use the sharing features on this page, please enable JavaScript. The nuchal translucency test measures the nuchal fold thickness. This is an area of tissue at the back of an unborn baby’s neck. Measuring this thickness helps assess the risk for Down syndrome and other genetic problems in the baby.

What is the difference between nuchal translucency and nuchal fold?

Nuchal fold thickness Nuchal translucency testing is distinctly different from and should not be confused with nuchal thickness testing. At the end of the second trimester (26 weeks), the nuchal translucency can no longer be seen and instead the nuchal fold thickness is measured between 16 and 24 weeks gestation.

What is a low risk NT measurement?

The nuchal translucency measurement is more than just a screening for Down syndrome. A very small nuchal translucency measurement – less than 2.5 mm – places the pregnancy in a low-risk group for problems, such as fetal heart abnormalities.