NUCHAL TRANSLUCENCY/Guidelines for NT Measurement

 

Guidelines for NT Measurement

Guidelines for NT Measurement

Guidelines for NT Measurement

Guidelines for NT Measurement

1.The margins of the NT edges must be clear

     enough for proper placement of the calipers.

2. The fetus must be in the midsagittal plane.

3. The image must be magnified so that it is filled

   by the fetal head, neck, and upper thorax.

4. The fetal neck must be in a neutral position,

    not flexed and not hyperextended.

5. The amnion must be seen as

    separate from the NT line.

 

Guidelines for NT Measurement

Guidelines for NT Measurement

Guidelines for NT Measurement

Guidelines for NT Measurement

6. The (+) calipers on the ultrasound must be

  used to perform the NT measurement.

7. Electronic calipers must be placed on the

   inner borders of the nuchal space with none of

   the horizontal crossbar itself protruding into the space.

8. The calipers must be placed perpendicular

   to the long axis of the fetus.

9. The measurement must be obtained

    at the widest space of the NT.

INCREASED NT

ØTrisomy 21 : Absent NB, AVSD

ØTrisomy 18 : Omphelocele, CHD, MSK, IUGR

ØTrisomy 13 : Holoprosencephaly, CHD

                    Omphelocele

ØTurner(XO) : Largest NT to Hydrops

 ØCHDs : 24x increased risk

ØSyndromes : MSK dysplasias ,,,so many