Antenatal screening

Question 1

What does the 20 week scan screen for?

Answer 1

• fetal defects

- placenta position

Question 2

What are the limitations of ultrasound screening sounds?

Answer 2

dependent on type of abnormality (whether it is found)
depends on maternal habitus
depends on fetal position at time of scan

Question 3

Name some conditions that should be screened

Answer 3

Anencephaly
Open spina bifida
Cleft lip
Diaphragmatic hernia
Gastroschisis
Exomphalos
Serious cardiac defects
Edwards/Patau

Question 4

Which 2 planes is the fetal brain examined in?

Answer 4

Transventricular

Transcerebellar

Question 5

How much weight do most women put on during pregnancy?

Answer 5

10-12.5kg

Question 6

What does the SAFE NIPT test for?

Answer 6

Mainly Down’s, Edwards and Patau

Question 7

What results in the combined test are suggestive of Down’s syndrome?

Answer 7

• large nuchal translucency
• PAPP-A low
• beta HCG high

Question 8

The excess of what could indicate a high chance of a neural tube defect?

Answer 8

AFP

Question 9

What can the 20 week ultrasound detect about the cervix?

Answer 9

Cervical insufficiency - dilatation and effacement too early in pregnancy