Ultrasound dating accuracy early

The scan will usually show that your pregnancy is less far along than suggested by your LMP.

This means that accurate dating reduces your chance of having your labour induced because your baby is thought to be overdue.

Ultrasound scans are considered to be safe for you and your baby when performed by trained professionals.

However, sometimes, having a scan can cause unnecessary worry.

As long as the timings are right, you can have the NT scan and blood test at the same appointment as your dating scan. That's because the screening test needs an accurate due date to be reliable.

Hormones in your blood vary according to your stage of pregnancy.

If you do know the conception date, this is counted as day 14, not day one.

If your cycle is irregular or you've recently been on the pill, working out the date from your LMP probably won't work. If the scan date differs from your period dates, the scan date will be used.

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You may have calculated the length of your pregnancy from the first day of your last menstrual period (LMP).

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It won't hurt, although you may feel a little pressure on your tummy.

If your womb (uterus) is very deep in your pelvis, or if you're overweight, you may be offered a vaginal scan, which can get a closer view of your baby.

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