Obstetric dating scan

obstetric dating scan

How is a dating scan performed?

How is a dating scan performed? A dating scan is carried out by ultrasound. A sonographer, who is usually a radiographer or a midwife trained in ultrasound, will complete your scan. If the scan is after 10 weeks, ultrasound recordings are usually made through your abdomen.

When should I have a dating scan if I am pregnant?

If you have had bleeding during your pregnancy or you have had previous miscarriages, your doctor or midwife may recommend an early dating scan from 6 to 10 weeks gestation. If you choose to have a dating scan, it will most probably be your first scan. You will need to get a referral from your doctor or midwife for a dating scan.

How do I prepare for an abdominal dating ultrasound?

Check with your ultrasound clinic for any preparation you need to do prior to the scan. For an abdominal dating ultrasound, you will need to have a full bladder. You may be asked to drink some water and not go to the toilet beforehand because a full bladder helps to push your womb up to give a better picture.

How is Downs syndrome diagnosed at a dating scan?

Screening for Downs syndrome will happen at the dating scan if: the scan takes place between 10 and 14 weeks of pregnancy The screening test for Downs 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 babys neck (nuchal translucency) with an ultrasound scan.

What is a dating scan and how does it work?

Dating scan. A dating scan is an ultrasound scan to determine how many weeks pregnant you are and your due date. Read on for more information about what a dating scan offers. Dating scans are used to confirm how many weeks pregnant you are and your expected due date.

When will I have a dating scan appointment?

Youll have a dating scan appointment, also known as a 12-week scan, between about 10 weeks and 14 weeks of pregnancy. This is usually the first scan you’ll have, so it’s likely to be a significant moment for you. Youll only have a scan before 10 weeks in certain situations.

What happens at a pregnancy dating ultrasound scan?

The pregnancy dating ultrasound scan: checks for some conditions in your baby that might be seen at this stage is part of the combined screening test for Down’s syndrome, Edwards’ syndrome and Patau’s syndrome, if you choose to be screened Specially trained staff called sonographers carry out the scan. Screening is your choice.

What happens if my scan date is different?

If the scan date differs from your last period dates, the scan date will be used. 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.

What tests are used to diagnose Down syndrome?

Down syndrome can also be diagnosed, or at least suspected, based on any of several prenatal tests including a nuchal translucency screening, sonogram, quadruple screen, or other blood tests.

How is Downs syndrome diagnosed during pregnancy?

The screening test for Downs 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 babys neck (nuchal translucency) with an ultrasound scan.

How is the risk of Downs syndrome determined?

Again, a computer program is used to give the risk of the baby having Downs syndrome, based on the blood test results, your age, the stage that you are at in your pregnancy, and your weight, ethnicity and smoking status. The quadruple test is not as accurate as the combined test and does not screen for Edwards syndrome and Pataus syndrome.

Do I have to have Downs syndrome screening?

All pregnant women should be offered a screening test for Downs syndrome. However, these tests are not compulsory. It is your choice as to whether you have the test or not. When will I be offered Downs syndrome screening? Screening can take place between 10 and 20 weeks of pregnancy.

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