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Second trimester ultrasound scan

Dr Yuranga Weerakkody et al.

The second trimester scan is a routinely performed ultrasound examination on all pregnancies in many countries between 18 and 23 weeks of gestation. This scan emphasises on fetal anatomy and therefore is also called a second trimester anatomy scan, also known as 'fetal anomaly scan' or 'TIFFA (targeted imaging for fetal anomalies) scan'.

It usually assesses the following paramters

fetal skull : integrity / shape
fetal brain : ventricles, choroid plexusus, mid brain, posterior fossa
fetal face : profile, orbits (including interocular diameter and binocular diameter), upper lip
fetal neck : nuchal thickness
fetal spine : transverse as well as longitudinal views
fetal heart
- fetal heart rate / rhythm
- four chamber view
- outflow tract views
- aortic arch view
fetal thorax : thoracic shape, size, lungs, diaphragm
fetal abdomen : stomach (including situs), liver, kidneys, bladder, abdominal wall, umbilicus
fetal limbs : echogenicity, measurements, hands, movements

In addition to this, standard fetal biometric parameters as well as the following features are also assessed

fetal lie
placental position
liquor volume
cord : number of cord vessels

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References

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1. Document from the Fetal medicine foundation : - www.fetalmedicine.com/fmf/18-23_Weeks_Scan.pdf
2. Document from SOGC Canada : - http://www.sogc.org/guidelines/documents/gui223CPG0903.pdf
http://www.rcog.org.uk/womens-health/clinical-guidance/ultrasound-screening#20week

Synonyms & Alternative Spellings

Synonyms or Alternative Spelling	Include in Listings?
Second trimester anatomy scan	✗
2nd trimester anatomy scan	✗
2nd trimester ultrasound scan	✗
Second trimester antenatal ultrasound scan	✗
20 week anatomy scan	✓
Anomaly scan	✗
TIFFA scan	✗