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Anomaly scan (second-trimester scan)

A Anomaly scan (second-trimester scan) is a ultrasound test of the pregnancy. It shows baby's organs and structure at 18 to 22 weeks, placenta position. No ionising radiation (sound waves).

General health information, not a diagnosis. In an emergency, call 102. Always consult a qualified health professional.

What it shows

Baby's organs and structure at 18 to 22 weeks, placenta position.

Why it is done

Routine detailed check in mid-pregnancy.

Preparation

Usually no preparation; some scans need fasting or a full bladder, as the centre advises.

Radiation & safety

No ionising radiation (sound waves). Safe in pregnancy.

How long it takes

30 to 60 minutes. General information, not a diagnosis. Results must be interpreted by a qualified health worker.

Sample type

Ultrasound

Consult a doctor to interpret results — a single test does not make a diagnosis.

Where to get this near you

Care near you

Uses your location once to list the nearest facilities. Nothing is stored.

Common questions

What does a anomaly scan show?
Baby's organs and structure at 18 to 22 weeks, placenta position.

Why is a anomaly scan done?
Routine detailed check in mid-pregnancy.

How do I prepare for a anomaly scan?
Usually no preparation; some scans need fasting or a full bladder, as the centre advises.

Does a anomaly scan use radiation?
No ionising radiation (sound waves). Safe in pregnancy.

How long does a anomaly scan take?
30 to 60 minutes

Why is Anomaly scan (second-trimester scan) done?
Routine detailed check in mid-pregnancy.

How do I prepare for Anomaly scan (second-trimester scan)?
Usually no preparation; some scans need fasting or a full bladder, as the centre advises.

Is Anomaly scan (second-trimester scan) safe in pregnancy?
No ionising radiation (sound waves). Safe in pregnancy.

SI text CC BY 4.0; RadiologyInfo.org (ACR/RSNA) and MedlinePlus linked as references only, no text copied.

Sources: SI health summary (own words); decoder imaging pack; RadiologyInfo.org and MedlinePlus as references only

Emergency — call102