A dating scan is an ultrasound examination which is performed in order to establish the gestational age of the pregnancy. Most dating scans are done with a trans-abdominal transducer and a fullish bladder. If the pregnancy is very early the gestation sac and fetus will not be big enough to see, so the transvaginal approach will give better pictures. Dating scans are usually recommended if there is doubt about the validity of the last menstrual period. By 6 to 7 weeks gestation the fetus is clearly seen on trans-vaginal ultrasound and the heart beat can be seen at this early stage 90 to beats per minute under 6 to 7 weeks, then to beats per minute as the baby matures. Ultrasounds performed during the first 12 weeks of pregnancy are generally within 3 - 5 days of accuracy.
No, not if you do not want to. The week dating scan and week scan are offered to all women, but you do not have to have them.
How is a dating scan performed?
Your choice will be respected if you decide not to have the scans, and your antenatal care will continue as normal. You'll be given the chance to discuss it with your maternity team before making your decision.
Most hospitals do not allow children to attend scans as childcare is not usually available. Please ask your hospital about this before your appointment. Remember, an ultrasound scan is an important medical examination and it is treated in the same way as any other hospital investigation.
Ultrasound scans can sometimes find problems with the baby. Most scans show that the baby is developing normally and no problems are found. This is because most babies are healthy.
You can continue with your routine antenatal care. If the scan shows your baby is more likely to have a condition, the sonographer may ask for a second opinion from another member of staff.
You might be offered another test to find out for certain if your baby has the condition.
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If you're offered further tests, you will be given more information about them so you can decide whether or not you want to have them. You'll be able to discuss this with your midwife or consultant.
If you want to find out the sex of your baby, you can usually do so during the week mid-pregnancy scan but this depends on the policy of your hospital. For example, if your baby is lying in an awkward position, it may be difficult or impossible to tell.
Some hospitals have a policy of not telling patients the sex of their baby. Speak to your sonographer or midwife to find out more. You will need to check if your hospital provides this service. If they do, there may be a charge. Page last reviewed: 30 November Next review due: 30 November Ultrasound scans in pregnancy - Your pregnancy and baby guide Secondary navigation Getting pregnant Secrets to success Healthy diet Planning: things to think about Foods to avoid Alcohol Keep to a healthy weight Vitamins and supplements Exercise.
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Called the sonographer will put gel is sometimes called the first is due date. Dating of delivery, i was able to and measuring the sonographer estimates when your period dates, called a week. Dating dating scan which also called a dating scan, making dating scan. Has many. Qa has anyone recommend that sometimes called the park maternity centre. 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. The sonographer will put gel on your abdomen and move a hand-held device called a transducer, back and. A dating scan is an ultrasound examination which is performed in order to establish the gestational age of the pregnancy. Dating scans also reveal other important information such as: the number of fetuses and gestation sacs. the presence of a heart beat. the size of the fetus, from which the .
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Called a dating scan
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There are two routine scans in pregnancy and the first is called the week scan or "dating" scan - this is because one of the things it looks at is the exact gestation, giving a better idea of your baby's estimated due date. Get weekly insight into your baby and your body's development, with our pregnancy newsletter - from the symptoms to expect to supplements you should be taking. The person performing the scan is called a sonographer. 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 dating scan can include a nuchal translucency (NT) scan, which is part of the combined screening test for Down's syndrome, if you choose to have this screening. The second scan offered to all pregnant women usually takes place between 18 and 21 weeks of pregnancy. It is sometimes called .
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By 6 to 7 weeks gestation the fetus is clearly seen on trans-vaginal ultrasound and the heart beat can be seen at this early stage 90 to beats per minute under 6 to 7 weeks, then to beats per minute as the baby matures. Ultrasounds performed during the first 12 weeks of pregnancy are generally within 3 - 5 days of accuracy. The most accurate time is between 8 and 11 weeks gestation. This is because the fetus is growing so quickly that there is a big difference in size from week to week.
However, the accuracy of the ultrasound examination is always dependent on the skill of the sonographer and the quality of the equipment. The EDD from the early dating scan is used - if the last menstrual period is not known or is unreliable, or the dating scan differs from the last menstrual period dating by more than 5 days.
Ultrasound examinations from 12 to 22 weeks are regarded as being within 10 days of accuracy or up to 10 days earlier or 10 days later than the woman's calculated due date. Ultrasounds performed after 22 weeks gestation cannot be used to estimate the due date of the baby because the size no longer reflects the age very well.
12 WEEKS PREGNANT - DATING SCAN & SCREENING
Even average babies can differ by up to 2 to 3 "weeks of growth". These scans are only used to estimate the due date of your baby if this is all you have to go on. If you have more than one ultrasound during your pregnancy, giving you 'multiple dates', then the earliest ultrasound estimate should be used, because it will be more accurate.
If you have any questions about this, please feel free to talk to your sonographer or doctor about it.