What Is the 20-Week Scan?

The 20-week scan, also known as the anatomy scan or anomaly scan, is a detailed ultrasound done halfway through pregnancy (usually between 18 and 22 weeks).

 Purpose of the 20-Week Scan

• Examine the baby’s major organs (heart, brain, kidneys, lungs, stomach).
• Measure baby’s growth (head, abdomen, femur length).
• Check for potential physical abnormalities or developmental issues.
• Confirm the placenta position and amniotic fluid levels.
• Often determine the baby’s sex, if you wish to know.

 What Happens During the Scan?

• Performed on your abdomen (transabdominal ultrasound).
• Takes about 20–30 minutes, sometimes longer if baby’s position makes viewing difficult.
• The sonographer carefully examines and measures all key structures.
• You’ll usually see your baby’s heartbeat, face, limbs, and movements clearly.

 Limitations and Considerations

• While detailed, it cannot detect every condition (some conditions may appear later).
• If issues are suspected, you may be referred for additional tests or scans.