How late can i have a dating scan

Read on for more information about what a dating scan offers. A dating scan might be recommended to confirm your due date if you are unsure of your last menstrual period or your date of conception. It is usually offered to pregnant women from 10 weeks to 13 weeks gestation, but can be carried out any time from 6 weeks. 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.

What is the purpose of the dating scan?

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.

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.

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Your pregnancy and baby guide

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 forward over your skin. In some situations, such as when the scan is completed before 10 weeks of gestation or you are overweight, you may also need a vaginal scan. Your sonographer will let you know if this is needed.

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. For a vaginal scan, you can have an empty bladder. This will provide a fairly accurate estimate of how many weeks pregnant you are.

Why would I have a dating scan?

But it is important to remember that only a few women go into labour on their due date, so it can be more helpful to think about the month in which you are expecting your baby, rather than the exact day. Information on pregnancy ultrasound scans including when they are taken, what it can be used for, dating scans, anomaly scans, plus links to trusted resources. This theory can predict the sex of your baby at just 11 weeks gestation.


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I had the same thing happen with my DD. At the 20 weeks scan she measured 17 weeks and they made me go back in 2 weeks when she measured 19 weeks. They tried to push my dates back but like you I knew when my LMP was and cycle length and I had had a scan at 9 weeks which was right for my dates. DD was born at 39 weeks weighing in at a whopping 4lb 11 or g tongue. No scan for dating is always right.

Mine have being cause i knew my last AF and how long it went for.

If you are concerned ask you doctor and see if you can have another scan done at a later date. Nodrog New Zealand Total posts: It seems pretty unlikely that you would ovulate 3 weeks late! My midwife said any scans after 12 weeks aren't accurate as by then the genetic differences will have started to show eg I'm 5 ft 9 and DH is 6 ft 3 so our baby is likely to be bigger than someone who is 5 ft 2 with a partner of 5 ft 9 IYKWIM.

With my current pregnancy I knew my LMP date but didn't get a positive test until over a week after AF was due, it turned out that I ovulated a week late. But as I said earlier it is pretty unlikely that you would have ovulated 3 weeks late without noticing as that is a week after your AF should have shown up.


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  7. Two bouncy boys New Zealand Total posts: No as acurate but neither is going off the date of your LMP With it so far out they will probably go off the new date. I know the exact date of my last LMP but I know I wasnt preg just opver 2 weeks ago but if im preg now im on day 68 of my cycle witch would make me like 8 - 10 weeks pregnant when I would really be no more then 5 weeks.

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