US Cutoffs Flashcards
1
Q
Megacisterna Magna?
A
> 10mm
2
Q
Nuchal Fold
A
> =6mm
3
Q
Ventriculomegaly
A
> =10mm
4
Q
UTD
A
UTDA1: 16-27w6d: 4mm-6.99mm >28w: 7 to 9.99mm
UTDA2: 16-27w6d: >=7mm >28w: >=10mm
5
Q
Pericardial Effusion
A
> 2mm
6
Q
Skin Edema
A
> 5mm
7
Q
Placentomegaly
A
2nd trimester: >40mm
3rd trimester: >60mm
8
Q
Physiologic Gut Herniation (timing and size)
A
<1cm, resolves by 11-12 weeks GA
9
Q
Bowel Dilation
A
> 7mm (at >14mm is associated with increased rates of atresia)
10
Q
Femur Length : Foot Length Ratio
A
<1 is suggestive of Skeletal dysplasia
11
Q
Femur length: Abdominal Circumference Ratio
A
<0.16 suggests lethality
12
Q
Chest circumference: Abdominal Circumference Ratio
A
<0.8 suggests lethality
13
Q
Marginal Cord Insertion
A
<2cm from placental margin
14
Q
CRL size to start moving towards HC?
A
> 84mm
