Anomaly Scan Checklist: What to Expect & How to Prepare
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- Dec 22, 2025
- 4 min read
Updated: Dec 23, 2025
Pregnancy involves several important milestones, and one of the most crucial is the anomaly scan, also known as the Level II ultrasound. This detailed scan provides valuable insights into your baby’s growth and structural development. When performed by experienced anomaly scan specialists in Chennai, it plays a key role in identifying potential concerns early and ensuring appropriate pregnancy care.
This article serves as a complete checklist to help expecting parents understand what an anomaly scan is, what it checks, when it is done, and how to prepare for it.
What Is an Anomaly Scan?
An anomaly scan is a detailed ultrasound examination performed during the second trimester of pregnancy, usually between 18 and 22 weeks. Its main purpose is to carefully evaluate the baby’s organs, bones, and overall anatomy to check for structural abnormalities.
Unlike routine scans that focus mainly on growth and heartbeat, the anomaly scan looks in depth at each major system of the baby’s body.
When Is the Anomaly Scan Done?
The ideal time for an anomaly scan is between 18 and 22 weeks of pregnancy.
Before 18 weeks: Some organs may not be fully developed for accurate assessment
After 22 weeks: Certain findings may be harder to evaluate, and options for further management become limited
That is why timely scheduling with qualified anomaly scan specialists in Chennai is essential.
What Does the Anomaly Scan Check? (Checklist)
During the scan, the specialist carefully evaluates multiple aspects of the baby’s development:
1. Brain and Spine
Brain structure and ventricles
Spine alignment and closure
Screening for neural tube defects
2. Face and Neck
Facial profile
Upper lip (to screen for cleft lip)
Neck structures
3. Heart (Fetal Cardiac Assessment)
Four heart chambers
Major blood vessels
Heart rhythm and position
Early signs of congenital heart defects can often be detected at this stage.
4. Abdomen and Internal Organs
Stomach position
Kidneys and bladder
Liver and bowel
This helps identify issues like kidney abnormalities or abdominal wall defects.
5. Limbs and Skeletal System
Arms, legs, hands, and feet
Bone length and alignment
Movement and symmetry
6. Placenta, Amniotic Fluid & Umbilical Cord
Placental location
Amount of amniotic fluid
Umbilical cord insertion and vessels
What the Anomaly Scan Cannot Do
It is important to have realistic expectations:
It cannot detect all genetic or chromosomal conditions
A normal scan does not guarantee the absence of all medical issues
Some conditions may develop or become apparent later in pregnancy
That’s why scan results are often combined with prior screening tests and clinical history.
How to Prepare for an Anomaly Scan
Here’s a simple preparation checklist for expecting parents:
No fasting required – you can eat normally
Wear comfortable, loose clothing
Carry all previous scan reports and test results
Arrive on time, as the scan may take 30–45 minutes
Be mentally prepared that the scan is detailed and requires patience
In most cases, a full bladder is not required, unlike early pregnancy scans.
What Happens If an Abnormality Is Detected?
If the anomaly scan shows a structural concern:
Your doctor may recommend a repeat or targeted ultrasound
Additional tests such as fetal echocardiography, NIPT, or amniocentesis may be suggested
You may be referred to a fetal medicine specialist for further evaluation
Many findings are minor or resolve on their own, and early detection allows better planning and monitoring.
Why Choose Experienced Anomaly Scan Specialists in Chennai?
An anomaly scan requires advanced equipment and expert interpretation. Choosing experienced specialists ensures:
Accurate assessment of fetal anatomy
Early detection of significant abnormalities
Clear explanation of findings
Access to follow-up testing and counselling if needed
Specialist centers follow standardized protocols to ensure no important detail is missed.
Emotional Support During the Scan
It’s normal to feel anxious before or during an anomaly scan. Remember:
Most scans show normal results
The scan is done to ensure the best care for you and your baby
Doctors and sonographers are trained to guide you compassionately
Open communication with your healthcare team can greatly reduce stress.
Conclusion
The anomaly scan is one of the most important evaluations during pregnancy. It provides a comprehensive look at your baby’s development and helps identify structural concerns at the right time. By preparing well and choosing experienced anomaly scan specialists in Chennai, expectant parents can approach this milestone with confidence, clarity, and peace of mind—knowing they are taking a vital step toward a healthy pregnancy journey.
FAQs
1. Is the anomaly scan mandatory?
While not legally mandatory, it is strongly recommended as it checks detailed fetal anatomy and development.
2. Is the anomaly scan safe for the baby?
Yes. It uses ultrasound waves and is completely safe for both mother and baby.
3. How long does an anomaly scan take?
Typically, 30 to 45 minutes, depending on the baby’s position and movements.
4. Can the anomaly scan detect Down syndrome?
It may show markers, but it cannot confirm chromosomal conditions. Genetic screening or diagnostic tests are needed for confirmation.
5. What if the baby’s position is not ideal during the scan?
You may be asked to walk, change position, or return for a repeat scan for better views.
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