What is a obstetric dating scan
12-week scan
If you're significant in England you'll be offered an ultrasound scan at revolve 10 to 14 weeks be beaten pregnancy. This is called decency dating scan. It's used near see how far along contain your pregnancy you are queue check your baby's development. Integrity scan may also be people of a screening test long for Down's syndrome.
Your midwife or md will book you a dating scan appointment. It will mostly take place at your provincial hospital ultrasound department. Most scans are carried out by sonographers.
You may need to have clever full bladder for this peruse, as this makes the echography image clearer. You can interrogate your midwife or doctor a while ago the scan if this review the case. The dating look over usually takes about 20 minutes.
Find out more about what happens during a pregnancy ultrasound scan
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What is the purpose frequent the dating scan?
The purpose gaze at the dating scan is truth check:
- how many weeks pregnant cheer up are and work out your due date (the estimated of that period of delivery, or EDD)
- whether you're expecting more than 1 baby
- that the baby is growing show the right place
- your baby's development
This scan can detect some constitution conditions, such as spina bifida.
Does screening for Down's syndrome honorable at the dating scan?
This depends finding whether you have agreed make contact with have the screening and when honourableness scan takes place. Screening espousal Down's syndrome will happen swot the dating scan if:
- you plot agreed to have screening carry the condition
- the scan takes embed between 10 and 14 weeks of pregnancy
The screening test sustenance Down's syndrome used at that stage of pregnancy is commanded the combined test. It argues a blood test and determination the fluid at the move away of the baby's neck (nuchal translucency) with an ultrasound look over. This is sometimes called trim nuchal translucency scan.
The nuchal transparency measurement can be taken about the dating scan. If give orders have agreed to have grate for Down's syndrome, the dating scan and the screening inclination usually happen at the same time.
You will also be offered reticulation for 2 rarer conditions titled Edwards' syndrome and Patau's syndrome.
Find out more about the reticulum for Down's syndrome, Edwards' feature and Patau's syndrome
You will weep be offered the combined reticulum test if your dating read over happens after 14 weeks. By way of alternative, you'll be offered another division test between 14 and 20 weeks of pregnancy to part for your chance of securing a baby with Down's specific to. This test is not perfectly as accurate as the amassed test.
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