ERU 22 - Obstetric Sonography Overview

Question 1

How many MHz for a TV probe?

For a TA probe?

Answer 1

5-10 MHz

3-5 MHz

Question 2

What is tested in a quad screen?
Which of these is NOT produced by the placenta?
When is it performed?

Answer 2

hcg, afp, estriol, inhibinA
alpha-FETOprotein: produced by the fetal yolk sac, GI tract, and liver
15-20 weeks gestation

Question 3

What is the Early 1st timester screening?

When is it performed?

Answer 3

A combination of pregnancy-associated plasma protein A, hcg, and fetal nuchal translucency.

11-14 weeks

Question 4

How early can NIPS be done?

Answer 4

9 weeks

Question 5

What would provide 10/10 score on a BPP?

Answer 5

• 30s fetal breathing
• 3 gross fetal body movements (trunk + limbs)
  1- flexion to extension of a limb or hand opening/closing
• 1 pocket of fluid measuring 1x1 cm
• NST with 2 15x15 accels

Question 6

Describe frank, complete, and incomplete breech positions.

Answer 6

Complete: hips and knees flexed
Frank: hips flexed, knees extended
Incomplete (footling): one or both feet down

Question 7

MSAFP will be INCREASED in what abnormalities?

Decreased?

Answer 7

Anencephaly, Cephalocele, Gastroschesis

Down syndrome, Edwards (Tris 18), Turner syndrome

Question 8

Elevated hcg, and inhibinA. Decreased estriol and MSAFP and PAPP-A
Diagnosis?

Answer 8

Down syndrome

Question 9

Decreased estriol, hcg, MSAFP, inhibin A, PAPP-A

Diagnosis?

Answer 9

Edward Syndrome (Trisomy 18) or Turner syndrome

Question 10

Elevated Inhibin A and MSAFP (mildly)

Diagnosis?

Answer 10

Patau syndrome (trisomy 13)