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'll be given a report of the scan which will tell you exactly how many weeks pregnant you are.
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Six weeks, the scan is done to:Check if the embryonic sac is intra-uterine (embedded inside the womb)see the number of fetussee the heart beatgive an accurate expected due date.
You are having a transvaginal scan (tvs), you will need to empty your bladder first.
All scans after 10 weeks can be done through your tummy, and most units ask you to arrive with a full bladder.
What is the best time to have a dating scan
Then the circumference of the head becomes the best way to measure your baby (nice 2008).
This means that, out of 20 women who have the scan, one woman will be wrongly told she is at high risk of having a baby with down's syndrome.
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If you feel a bit apprehensive about a vaginal scan, you may feel less worried if you:talk over the procedure with your nurse or sonographer.
Dating scan is a more precise way of establishing your due date than counting from your last monthly period (lmp).
How big your baby will be depends on when you have the scan:At 10 weeks, your baby measures about 3cm (1.
When is the best time to have a dating scan
Your sonographer may ask to carry out a vaginal scan rather than one via your tummy.
Combined nuchal translucency (nt) scan and blood test gives a more accurate diagnosis than an nt scan alone.
, the timing of your first scan will also depend on how your pregnancy is going, and where you live.
A blighted ovum or missed miscarriage has been diagnosed, you will have the choice of letting nature take its course or having a minor operation.
You could have a dating scan without nt screening, or even change your mind on the day of your scan.
In these early weeks of pregnancy, your baby is too small and low in your abdomen to be picked up by an abdominal ultrasound scan.
Units offer a screening test for down's syndrome at the same time as the dating scan.
If the scan date differs from your period dates, the scan date will be used.
Your womb (uterus) is very deep in your pelvis, or if you're overweight, you may be offered a vaginal scan, which can get nearer to your baby.
If your menstrual cycle is irregular or you don't remember the first day of your last period, an ultrasound scan can tell exactly how far into your pregnancy you are.
Your midwife or gp will only recommend an early scan if there's a concern, for example, if you've had bleeding in this pregnancy.
You're found to be fewer than 11 weeks pregnant at your dating scan, or your baby measures less than 45mm, you'll be able to rebook your combined screening.
The nurse or assisting staff will usually cover your legs with a sheet while the scan is happening.
Scans can be inconclusive and not all pregnancies are exactly the same, there are very strict guidelines for scans in early pregnancy.
Developing embryo measures about 1cm to 2cm and should now be easier to see on the scan.
From 2018, nipt will be offered on the nhs in england to women that have a high-risk result from the combined test.
, some major problems can be seen at your dating scan, such as issues with the umbilical cord or with your baby's skull or abdominal wall.
You'll also have a blood test if you're carrying twins, though not if you're carrying triplets or more (nice 2011).
The scan is usually done through your tummy, though sometimes a vaginal scan will offer a better view.
Your baby the best start in life means getting your own health sorted well before you become pregnant.
Ask your gp if you want to have one anyway for extra reassurance, as she may be able to refer you.
May have calculated the length of your pregnancy from the first day of your last menstrual period (lmp).
Is possible though that when you have another scan, your doctor still cannot detect a heartbeat.
A dating and viability scan, between six and nine weeks and an early morphology scan or nt scan between 11 and 13 weeks.
Waiting for this can be worrying but remember that most pregnancies are successful and you will probably find all is well when you go back for a second scan.
Baby will probably want to breastfeed eight to 15 times a day for the first one or two days.
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.
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You're more likely to need a vaginal scan if you're overweight or have a bloated tummy from wind, or if your baby's lying in an awkward position.
This means that accurate dating reduces your chance of having your labour induced because your baby is thought to be overdue (lefevre et al 1993, nice 2008).