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At 10 to 14 weeks of pregnancy, you should be offered a pregnancy dating scan. It will let you know a more reliable due date and check how your baby is developing.
If you're pregnant in England you'll be offered an ultrasound scan at around 10 to 14 weeks of pregnancy. This is called the dating scan. It's used to see how far along in your pregnancy you are and check your baby's development. The scan may also be part of a screening test for Down's syndrome.
Your midwife or doctor will book you a dating scan appointment. It will usually take place at your local hospital ultrasound department. Most scans are carried out by sonographers.
You may need to have a full bladder for this scan, as this makes the ultrasound image clearer. You can ask your midwife or doctor before the scan if this is the case. The dating scan usually takes about 20 minutes.
Find out more about what happens during a pregnancy ultrasound scan
The purpose of the dating scan is to check:
This scan can detect some health conditions, such as spina bifida.
This depends on whether you have agreed to have the screening and when the scan takes place. Screening for Down's syndrome will happen at the dating scan if:
The screening test for Down's syndrome used at this stage of pregnancy is called the combined test. It involves a blood test and measuring the fluid at the back of the baby's neck (nuchal translucency) with an ultrasound scan. This is sometimes called a nuchal translucency scan.
The nuchal translucency measurement can be taken during the dating scan. If you have agreed to have screening for Down's syndrome, the dating scan and the screening will usually happen at the same time.
You will also be offered screening for 2 rarer conditions called Edwards' syndrome and Patau's syndrome.
Find out more about the screening for Down's syndrome, Edwards' syndrome and Patau's syndrome
You will not be offered the combined screening test if your dating scan happens after 14 weeks. Instead, you'll be offered another blood test between 14 and 20 weeks of pregnancy to screen for your chance of having a baby with Down's syndrome. This test is not quite as accurate as the combined test.
Find out more about:
It's important to continue taking any medication prescribed unless your GP/specialist specifically tells you to stop. Please visit our Existing Health Conditions page for more information, or visit 'Bumps' ('Best Use of Medicines in Pregnancy').
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