Fetal nuchal skin thickness is useful in detecting:: (A) Fetal infection, (B) Down syndrome, (C) Anencephaly, (D) Hydrops fetalis
Answer is B. Nuchal thickness should be less than 3 mm in 12 to 13 weeks It should be < 6 mm after 14 weeks and it is called as nuchal fold Nuchal thickness/fold > 6 mm after 14 weeks is suggestive of down's syndrome