Every pregnant woman wants to know her due date. But a due date calculated from last menstrual period with a due date calculator often doesn’t match the due date that is estimated by ultrasound also known as a sonogram. During an ultrasound, a technician spreads a warm gel over the lower part of the abdomen, and then presses a tool called a transducer against the belly to examine the fetus using sound waves. An image of the fetus appears on an accompanying computer screen. While looking at this image, the technician takes some standard measurements from different angles and listens for a heartbeat. Sonograms are risk-free, and seeing your baby will likely be an enjoyable experience. Naturally, one of the most common questions asked about ultrasound is: Just how accurate are due dates predicted by ultrasound?
Can your pregnancy scan give the wrong due date?
All of the women, of course, went into spontaneous labour. While the research is retrospective and thus only as good as the notes which professionals kept at the time, the study is very large and includes data from 18, women. In short, the researchers found that there were no meaningful differences between the prediction of date of birth by scan and last menstrual period LMP. Which means, they conclude, that if the woman feels her own menstrual dates are reliable, there is no need for an early dating scan.
The dating ultrasound scan. This scan can be carried out from 6 weeks to 18 weeks. The most accurate time to date you pregnancy is after 8 weeks through to
Obstetric ultrasound, also known as prenatal or pregnancy ultrasound, uses high-frequency sound waves to produce images of a developing embryo or fetus. Your doctor will use information from obstetric ultrasounds to track pregnancy progress, gestational age and help predict delivery dates. During an obstetric ultrasound, you will be on a bed, usually on your back.
You may be asked to change position during your scan. Changing position helps move your organs and the fetus into a better position so the sonographer can capture high-quality images. If you have an Alberta Health Care card or valid health care card from out of province, there is no cost for an obstetric ultrasound except in Quebec. An obstetric ultrasound scan lasts approximately 45 to 60 minutes. If you have multiple fetuses, the exam will take longer, usually about 90 minutes.
One significant other is welcome to join you in the room for the entire duration of the exam. Your plus-one can be anyone important in your life who you want to share the experience with, such as your husband, wife, girlfriend, boyfriend, mother, sister, etc. If you have more family who would like to attend the scan, our sonographers are willing to bring them into the room near the end of the exam to show them images of the baby.
However, we do not allow more than one person in the room for the entire duration of the exam.
Women’s LMP dates are just as accurate as scans…
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5-11 Week Early Pregnancy Scan
Why have a Viability and Dating Scan? Most women will not need to have an ultrasound examination in early pregnancy but there are some situations (uncertain.
An early pregnancy scan, offered between weeks 5 and 11 of pregnancy, is also known as a first trimester viability scan, or a dating scan. Many of our patients, who have experience of healthcare in the USA or the rest of Europe, are used to the early pregnancy scan being a routine part of their pregnancy care. The first ultrasound scan in pregnancy is often taken up by women with a history of previous problems, such as ectopic pregnancy or recurrent miscarriages, and by women undergoing assisted reproductive techniques such as IVF.
It is also requested for early reassurance or accurate dating, when there is no history of previous problems. You can come to us for an early pregnancy scan from week 5 of pregnancy, which is 1 day after the first day of your missed period. We are happy to see you with or without a doctor’s referral. An early pregnancy scan takes around 30 minutes and is carried out by either our specialist prenatal sonographer Ms Ciara McKenna or our doctor Dr David Nyberg who specialises in prenatal diagnosis.
You will be able to see the images of your baby on screen and your specialist will talk through them in detail with you, and advise you about what you need to do next. Our prenatal doctor and sonographer will review and discuss the ultrasound images before sending a report to your doctor within 24 hours. We’ll give you a copy of your report shortly after your appointment, or we can send one by email. These tests can nowadays be done from week 9 or 10 of pregnancy and results are normally received within 5 to 7 days.
This means you can get the results of your chosen NIPT even before having your week scan. However, our golden rule is to go ahead with your NIPT only when a scan has confirmed that all is going well at that point of your pregnancy. It usually takes about 15 minutes and gives reassurance that all is fine.
Dating ultrasound scan: 11 to 14 weeks of pregnancy
The first trimester can be an exciting but anxious time. Expectant parents often need to wait for up to 15 weeks before they get their public maternity hospital appointment and the reassurance that everything is fine with their baby. With our private ultrasound scans, you can get this reassurance as soon as 8 weeks gestation so you can begin to enjoy your pregnancy with peace of mind. Pregnancy Scans performed during the first 12 weeks of pregnancy are generally within 3 — 5 days of accuracy.
The most accurate time for the due date calculation is between 8 and 11 weeks pregnant.
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Throughout my pregnancy , I’ve received two different due dates — one came from my very first ultrasound, when my baby was barely the size of a blueberry, the date that was then subsequently stamped on my record as “the” due date. But then there was a second date, the one that showed up on my next couple of ultrasound scans. This date was a few days earlier. It’s also the date that I prefer, not only because I’m now 38 weeks pregnant and ready to get this baby out, but because it matched the date I’d calculated on my own using information I looked up.
And how much does it really matter? After all, as many moms know, due dates are just educated guesses. Traditionally, estimated due dates are calculated by taking the start date of a woman’s last menstrual period and adding a year, subtracting three months and adding seven days, a method known as Naegele’s rule. But that method doesn’t account for irregularities in a woman’s menstrual cycle — if she has a longer or shorter cycle than 28 days or any variability with ovulation, for example.
How are Due Dates Calculated?
If you were having regular periods before pregnancy, your doctor will calculate your due date based off of your last menstrual period. This goes back to the fact that in order to get pregnant, your body ovulated—or released an egg—roughly in the middle of your cycle and it was fertilized by sperm. That was the moment of conception.
Pregnancy Scans performed during the first 12 weeks of pregnancy are generally within 3 – 5 days of accuracy. The most accurate time for the due date.
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How early can you have a pregnancy dating scan
Measurements of the baby can be done more accurately after 8 weeks gestation. The most ideal time for dating scan is between 8 to 12 weeks of pregnancy.
Please note that our website only supports modern browsers. In order to properly experience our website you should upgrade your web browser to a current version. Please visit one of the following links to upgrade to the current version of a modern browser. As the name suggests, this date is just an estimate. It is likely you will start labor any time from two weeks before or two weeks after this estimated date. It is unlikely that your baby will be born exactly on the estimated date of delivery.
X It appears your browser is not compatible with our website. Pregnancy Planner. Contact Us. However, the exact date of your ovulation is rarely known.