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OB/GYN 303 > Module 17: Nuchal Translucency > Flashcards

Module 17: Nuchal Translucency Flashcards

1
Q

What view must the fetus be in for a NT?

A

Mid-sagittal

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2
Q

What six structures should be seen in a mid-sagittal view of the fetus?

A
  1. Midline structures of brain
  2. Mesencephalon
  3. Cerebellum
  4. 4th ventricle
  5. Cisterna magna
  6. Occipital bone
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3
Q

In a fetus with a chromosomal abnormality when does the nuchal fluid begin to increase and when does it decrease?

A

Increases at 11 weeks

Decreases after 14 weeks

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4
Q

What are factors that would cause an increased nuchal translucency?

A
  1. Chromosomal defect
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5
Q

What is the minimum CRL for NT?

A

45 mm (11weeks)

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6
Q

What is the maximum CRL for NT?

A

84 mm (13w6d)

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7
Q

Describe the necessary magnification for a NT: (2)

A
  1. Only fetal head and thorax on image

2. 3-4 cm depth on screen

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8
Q

What is nuchal translucency?

A

The U/S appearance/size of the subcutaneous accumulation of fluid behind the fetal neck in the 1st trimester of pregnancy

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9
Q

What is the window of time that nuchal translucency can be done?

A

11 wks - 13wk 6 days

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10
Q

What is NT inaccurate after 14 weeks?

A

Vertical fetal position changes NT

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11
Q

How accurate is NT on it’s own?

A

80%

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12
Q

How accurate is NT + blood work?

A

90%

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13
Q

What blood work is done with NT?

A
  • bHCG

- PAPPA

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14
Q

What is 30 min lab processing time called?

A

OSCAR

One Stop Clinics for early Assessment of Fetal Risk

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15
Q

What is the necessary position for NT?

A
  • True SAG (nasal bone + nuchal together)

- Fetus in neutral position

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16
Q

How can hyperextension affect the NT?

A

Can create a 0.6 mm increase in NT

Head turned can increase as well

17
Q

How can flexion affect the NT?

A

Can create a 0.4mm decrease in NT

18
Q

What is the criteria for the amnion when doing NT?

A

Fetus should be lifted off the amnion

19
Q

Where should the NT measurement be done? (2)

A
  • Widest portion of NT

- Anywhere from occiput to the thorax

20
Q

What is the caliper placement for NT?

A

Inner to inner

21
Q

What is the pregnancy loss rate of amniocentesis?

A

1/200

22
Q

What is the mean NT for CRL of 45mm and 84mm?

A

45mm = mean NT of 1.2 mm

84mm = mean NT of 1.9 mm

23
Q

What is the meas of NT in the 95 percentile for a CRL of 45mm and 84mm?

A

45mm = NT of 2.1mm

84 mm = NT of 2.7 mm

24
Q

What is the 99 percentile (NT) for CRL of 45mm and 84mm?

A

Both = NT of 3.5 mm

1% of pregnancies

25
Q

What is a nuchal umbilical cord?

A

A cord that is wrapped around the neck

26
Q

How is NT measured in the presence of a nuchal umbilical cord?

A

The NT meas is taken above and below the cord and then averaged.

OB/GYN 303 (21 decks)

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