Nuchal fold thickness
Thick Nuchal Fold
One of these tests, performed during the first trimester, is called a nuchal translucency screening, which is basically an ultrasound that scans for certain medical conditions.
This avoids the mistake of placing the calliper on the fuzzy edge of the line which causes an underestimate of the nuchal measurement.
This is a common normal finding.
This is the area that looks black, while the skin of the baby looks like a white line.