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Maternal-Fetal MedicineSociety
SG-004GuidelineUltrasound

Second-trimester anomaly scanning standard

Twenty-two mandatory anatomical views, image quality criteria, documentation requirements and audit methodology.

Version 1.336 pagesUpdated 30 May 2026Ultrasound Diagnostics Committee

Key recommendations

  • 22 mandatory anatomical planes
  • Optimal window for scanning: 18–22 weeks
  • Images archived for at least 10 years
  • Quarterly internal audit of 5% of studies

The standard is based on ISUOG international recommendations, adapted to locally available equipment and staffing.

When an abnormality is found

Where a structural anomaly is suspected, the patient should be referred to a tertiary centre within seven days.

Note: A guideline is a recommendation and does not replace the clinician's professional judgement in an individual case. Departing from it is acceptable where the reasoning is documented.