What is an Anomaly Scan (18–24 Weeks)?

The Anomaly Scan, also known as the mid-pregnancy or detailed fetal anatomy scan, is a comprehensive ultrasound examination carried out between 18 and 24 weeks of pregnancy. It assesses the baby’s organs, growth, anatomy and overall development.

During the scan, the sonographer examines the baby’s brain, spine, heart, face, kidneys, stomach, limbs and abdominal organs, as well as the placenta, amniotic fluid and umbilical cord. The scan also checks the baby’s position and confirms gestational progress.

This scan is a key part of routine antenatal care and plays an important role in identifying structural abnormalities or developmental concerns.

When the Anomaly Scan is recommended

The Anomaly Scan is routinely offered to all pregnant women between 18 and 24 weeks gestation.

It may also be particularly important if you:

• Are attending routine mid-pregnancy screening
• Have a family history of congenital conditions
• Had findings on earlier pregnancy scans
• Have diabetes or other medical conditions
• Are over 35 years of age
• Have had previous pregnancy complications
• Require reassurance about fetal development
• Need detailed assessment of fetal anatomy

What the Anomaly Scan assesses

The scan provides a detailed assessment of:

• Brain and skull development
• Spine and spinal alignment
• Heart structure and chambers
• Face and lips
• Stomach, kidneys and bladder
• Arms, legs, hands and feet
• Placenta location
• Amniotic fluid volume
• Umbilical cord structure

Benefits of an Anomaly Scan (18–24 Weeks)

• Detailed assessment of fetal anatomy
  Examines major organs and structures.
• Early detection of structural abnormalities
  Identifies many congenital conditions.
• Reassurance about baby’s development
  Confirms normal growth and anatomy.
• Assessment of placental position
  Important for delivery planning.
• Evaluation of amniotic fluid levels
  Supports overall pregnancy health.
• Supports pregnancy care planning
  Guides further monitoring if needed.
• Non-invasive and safe
  Uses ultrasound, not radiation.
• Standard part of antenatal screening
  Widely recommended in pregnancy care.

How the Anomaly Scan is performed

Home-Based Ultrasound Scans (UK-wide)

• Book your ultrasound appointment online or by phone
• A qualified clinician travels to your home or chosen location
• The scan is performed in the comfort and privacy of your home
• Scan duration varies by examination type (typically 10–30 minutes)
• Findings are explained during or shortly after the scan

Important:
All ultrasound scans are provided as home-visit services only. This service is available UK-wide, allowing you to access diagnostic imaging without attending a clinic.

Understanding your Anomaly Scan results

Normal findings

All assessed organs and structures appear to be developing normally for gestational age.

Typical report:

• Normal fetal anatomy scan

Minor findings

Some variations may be noted that are not clinically significant but may require observation.

Typical report:

• Minor variant noted

Structural abnormalities

If a potential concern is identified, further investigation or referral may be recommended.

Typical report:

• Further assessment advised

Results are explained in context, and additional scans or specialist input may be offered if needed.