What should nuchal fold be at 16 weeks?

The nuchal fold thickness is considered normal if under 5mm between 16 and 18 weeks gestation and under 6mm between 18 and 24 weeks gestation. An increased thickness corresponds to increased risk for aneuploidy and other fetal abnormalities.

Is 3 mm nuchal translucency normal?

First trimester measurement of NT at 12 weeks of gestation was 3.2 mm during the routine first trimester screening. The normal range of NT for this age is 1.1-3 mm. Although she refused to undergo amniocentesis (karyotype) and fetal echocardiography, triple test and follow-up prenatal ultrasound findings were normal.

What if NT is high?

An increased NT has also been associated with a high risk of miscarriage or fetal death. This risk increases with increasing NT thickness, and miscarriage or fetal death may be preceded by cardiac failure symptoms such as fetal hydrops.

What is a normal nuchal translucency?

Nuchal translucency (NT) is the normal fluid-filled subcutaneous space between the back of the fetal skin and the overlying skin.[1] NT is visible and can be measured by ultrasonographic imaging between 11 weeks and 14 weeks gestation.[2]

What is normal fetal nuchal translucency at 13 weeks?

Results. Among these subjects, the extent of fetal nuchal translucency ranged from 3 to 48 mm (median, 6) at a mean gestational age of 13.5 weeks (range, 10 to 15), and the fetal karyotype was abnormal in 18 (24 percent).

How does nuchal translucency change with gestational age?

Results: Nuchal translucency measurements varied considerably with gestational age; this variation followed a fetus-specific pattern. In 94% of cases, we observed an increase followed by a steady decrease in nuchal translucency measurement.

When should a nuchal translucency screening be done?

When a nuchal translucency screening is done. NT screening must be performed between 11 and 13 weeks of pregnancy. After that, the tissue gets so thick that it’s no longer translucent, making test results inconclusive.