Southampton dating scan

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You won't be offered the combined screening test if your dating scan happens after 14 weeks.Instead, you will be offered another blood test between 14 and 20 weeks of pregnancy to screen for the risk of Down's syndrome.All pregnant women in England are offered an ultrasound scan at around 8 to 14 weeks of pregnancy. It's used to see how far along in your pregnancy you are and check your baby's development.Your midwife or doctor will book you a dating scan appointment.The dating scan will also show if you're expecting twins, triplets, or more. It's helpful to know about twins early on, and it's easier to see whether or not they share a placenta during the first trimester. However, conception doesn't actually occur until around 14 days after your LMP, or later if your cycle is longer than 28 days. Multiple pregnancy: antenatal care for twin and triplet pregnancies CG129.

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Keep it with your maternity notes so your midwife and anyone else involved in your care can see it. This measurement, known as the crown rump length (CRL), is very accurate in the first trimester.

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.

Finding out about having twins early in pregnancy also gives you more time to prepare for the birth and for your doctor and midwife to plan your care. Nearly all scans after 10 weeks can be done through your tummy, and most units ask you to arrive with a full bladder.

The sonographer will put some gel on your tummy and move a small hand-held device (transducer) over your skin to get views of your baby.

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