Anomaly Scan (18-24 Weeks)
The Anomaly Scan is a detailed pregnancy ultrasound performed between 18 and 24 weeks, designed to assess your baby’s development and identify structural abnormalities.
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Details about Anomaly Scan (18-24 Weeks)
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.
How It Works
Simple steps to get your results
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Attend one of our UK or London clinics, arrange a home nurse visit, or use a finger-prick kit where available.
Get Your Results
Your sample is analysed by accredited UK laboratories, with secure results delivered directly to you.
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WhatsApp UsHow to Prepare for Your Test
Follow these guidelines for accurate results
Sample Timing
Where possible, attend your blood test between 7am and 12pm. Please wait until any short-term illness or infection has fully resolved before testing. Avoid intense exercise for 24–48 hours beforehand, as this can affect certain markers.
Fasting & Hydration
Fasting is not always required, but some tests may recommend it. If fasting is advised, avoid food for 8–12 hours before your appointment and drink water only. Stay well hydrated, as this helps with sample collection and accuracy.
Medications & Supplements
Continue prescribed medications unless advised otherwise by your clinician. Avoid vitamin, mineral, or biotin supplements for at least 24–48 hours before your test, as these can interfere with results. If you are unsure about any medication or supplement, please let us know before your appointment.
Hormones & Menstrual Cycle
For hormone-related tests, timing within your menstrual cycle may be important. If relevant, follow any specific guidance provided on your test page.
If you have any questions or special circumstances, our team is happy to advise before your appointment.