Your 12-Week Scan: The Complete Guide
The 12-week scan (also called the dating scan) is one of the most exciting moments of early pregnancy. Here's everything you need to know about what happens, what they check, and how to prepare.
Table of Contents
- What Is the 12-Week Scan?
- What Happens During the Scan?
- Can I Bring Someone?
- Do I Need a Full Bladder?
- What If They Find Something?
- Can They Tell the Gender?
What Is the 12-Week Scan?
The 12-week scan is your first detailed ultrasound. It's done between 11+2 and 14+1 weeks. The scan confirms your due date, checks your baby's development, and screens for chromosomal conditions through the nuchal translucency (NT) measurement.What Happens During the Scan?
You'll lie on a couch and the sonographer will apply gel to your abdomen, then use an ultrasound probe to view your baby. The scan takes about 15-20 minutes. The sonographer will: measure the baby (CRL); check the heartbeat; measure the nuchal translucency (NT); check overall development.Can I Bring Someone?
Yes, you can bring one person (usually your partner). Some hospitals allow more. Check your hospital's policy. Children are sometimes allowed but check first.Do I Need a Full Bladder?
Usually not for an abdominal scan at 12 weeks, as the baby is large enough to see without it. However, some hospitals may ask you to drink water before the scan. Check your appointment letter.What If They Find Something?
If the NT measurement is high, you'll be offered further testing (NIPT, CVS, or amniocentesis). If there are concerns about development, you'll be referred to a specialist. Most 12-week scans show a healthy baby.Can They Tell the Gender?
NHS sonographers don't assess gender at 12 weeks. However, you can try nub theory from your scan photo - see our nub theory guide for how to read the nub angle.Frequently Asked Questions
### How long does the 12-week scan take?About 15-20 minutes. If the baby is in a difficult position, it may take longer as the sonographer waits for the baby to move.
Can I get a photo from my 12-week scan?
Most NHS hospitals offer scan photos, sometimes for a small fee (usually £2-5). Some give free photos. Check your hospital's policy.
This article is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider.
Last reviewed: June 2026
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