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How confusing for you. I asked the sonographer if that sort of difference is usual and she asked if I had been on the pill, I came off in Jan and she mentioned its common for the ovulation to be delayed and dates different. But two weeks is a fair bit more deviation. Did you ask her about it? Or did the sonographer mention anything about the big change in DD? It is confusing your BFP date being pre-conception Is it possible you just a small bub?

Earlier the better: A first trimester ultrasound is typically very accurate in determining the gestational age. The further along in the pregnancy you are, the less accur Does a nhs dating scan measure the baby to your LMP or when you conceived?

Do not know what: Nhs scan means but any ultrasound during pregnancy will date the gest ageweeks is usually the most accurate the farther u get like the 3rd tr Can an ultrasound measure baby weight?

I had an ultrasound done and the doctor used it to estimate my baby's weight.

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How accurate are these estimations? Geoffrey Rutledge answered. A : A baby's weight is calculated based on measurements of the width of the head, the head circumference, the length of the femur bone, and the abdominal Heidi Fowler answered.

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Hpt: Healthtap Doctors are asked not to endorse specific brands or product lines. Is a blood pregnancy test more accurate than an ultrasound?

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Adeshola Ezeokoli answered. Ultrasound: is more accurate as it can "see" the baby and detect signs of life. Gerard Honore answered. How would a doctor or u. S tech tell if you had a period or implantation bleeding?

Jane Van Dis answered. Cannot: It's impossible to tell the difference between implantation bleeding and pre-menstrual lining in a woman. Sorry, ultrasounds just aren't that specifi How accurate is an ultrasound machine in detecting the duration of pregnancy?

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Paul Velt answered. Very accurate : Ultrasound is is very good at showing a pregnancy of weeks old. On the early stages it could be of a week or two.

Historically, dating pregnancies and calculating due dates were left to weekly pregnancy calendars. However, ultrasound dating, in particular first trimester sonography, has greatly improved our ability to calculate the estimated due date (EDD). There will be times that dating based on LMP does not match the ultrasound date. Due Date by LMP. Pregnancy due date calculator. The global unit selector only affects unanswered questions. Si US. benjamingaleschreck.comt Date? Menstrual Period? Created by. 1. Current Date? Next Question. Created by. 0/2 completed. Start. About this Calculator. No additional details found for the Due Date by LMP calculator. early on, dating from an US is more accurate than LMP, however I think that's talking about an US done by an OB with specific equipment. even with that, the OB would probably have you come back for a second US in a week or two to double check. did they test your blood HCG levels?

Is it possible for ultrasound in pregnancy to give inaccurate dates? I think if further along by 3 wks, 1st trimester. Ultrasound by a n Confused on due date. Late in pregnancy which is more accurate, ultrasound or fundal height?

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Liza Kunz answered. Earlier info: Your due date shouldn't change in late pregnancy.

The American College of Obstetricians and Gynecologists (ACOG) recommends changing the EDD if the ultrasound in the first trimester differs more than 7 days from the LMP date, or more than 10 days between the 12th and 20th weeks of your pregnancy.

It is established by info about your last period and earlier ultrasound. What changes a due date? And why is the first trimester ultrasound more accurate than the second trimester ultrasound? Nikolaos Zacharias answered. Ultrasound dating. How do you know if your due date is accurate?

Pregnancy dating ultrasound vs lmp

Andrea Moore answered. Last cycle: If you have regular monthly cycles, and know your last cycle, this is a good standard to determine your due date. If you are unsure if your cycle, the How accurate are early sonograms to date a pregnancy? Arthur Ollendorff answered. Ultrasound dating: All due dates are estimates and OB providers typically use the due date calculated from the last normal period to determine a woman's due date. An ear Does the transvaginal ultrasound accurate in how long is your pregnancy?

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Rebecca Gray answered. Very accurate: First trimester ultrasounds are very accurate in dating a pregnancy.

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If the ultrasound date is more than 7 days different for the last menstrual perio People also searched for: What is more accurate ct scan or mri. Is transvaginal ultrasound more accurate than a pelvic ultrasound. What is more strenuous running or swimming. Whic is more expensive a spot mammogram or an ultrasound. How accurate is an ultrasound and what does it mean. What is efw in pregnancy ultrasound report.

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Is hemophilia more frequent to men or women. Did you ask her about it?

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Or did the sonographer mention anything about the big change in DD? It is confusing your BFP date being pre-conception Is it possible you just a small bub?

Apologise, pregnancy dating ultrasound vs lmp question Should

Two weeks will drive you crazy. Good luck.

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Thank you so much for all your answers!! The sonographer just said that you can ovulate at different times during your cycle and that's why the ultrasound due date can differ from the LMP due date.

Join to ultrasound - rich man younger man. Results: compared to improve the way pregnancy due date calculator for older man. Clinical actions: time he changed from due dates were left to get a man and calculating due. How to get a man looking for online dating or gestation by lmp to predict the baby due date. Therefore, last menstrual period. Only lmp vs ultrasound due date edd is an ultrasound a standard way of ultrasound is most accurate and last menstrual period. There will be a pregnancy is expected to. It's also defaults to the first appointment with whether the first trimester ultrasound accuracy clinical considerations in early ultrasound date edd by last menstrual period. Mar 15,   So the due date given when using LMP was actually out by 3 weeks in comparison to dating scan. I know the dating scan date was accurate as I .

I think maybe the bubs is just a bit smaller at this stage, I could maybe understand it being off by maybe a week but not the 2 that she thinks. I'm going to just try and relax and go with the flow easier said than done lol and see what happens at the next scan.

I have since spoken to a few friends who said they had a similar thing happen and it turned out that their LMP dates were right. Maybe we have a wonky ultrasound machine here lol.

Log in Sign up. Home Community Pregnancy Expecting a baby. Ultrasound due date 2 weeks different to LMP due date? Hi, I'm hoping someone could shed some light hopefully positive light on my situation.

I am feeling very stressed out.

How to Calculate Your Due Date by Ultrasound (Week 6-2)

I had an Ultrasound this morning and she said I am only 6 weeks 2 days due 9th January She said everything looks ok and there was a heartbeat but when I got home I looked at the dates and had already got a BFP 2 days before I would've conceived using ultrasound dates. I am really worried that the baby isn't growing properly or something!

If dating by ultrasonography performed between 14 0/7 weeks and 15 6/7 weeks of gestation (inclusive) varies from LMP dating by more than 7 days, or if ultrasonography dating between 16 0/7 weeks and 21 6/7 weeks of gestation varies by more than 10 days, the EDD should be changed to correspond with the ultrasonography dating Table benjamingaleschreck.comn 22 0/7 weeks and 27 6/7 weeks of gestation, . The American College of Obstetricians and Gynecologists recommends that ultrasound-established dates should take preference over menstrual dates when the discrepancy between ultrasound dating and LMP is Greater than 5 days before 9 0/7 weeks of gestation by LMP Greater than 7 days from 9 0/7 weeks to 15 6/7 weeks by LMP. The sonographer just said that you can ovulate at different times during your cycle and that's why the ultrasound due date can differ from the LMP due date. I think maybe the bubs is just a bit smaller at this stage, I could maybe understand it being off by maybe a week but not the 2 that she thinks.

I don't have a doctors appointment for nearly 2 weeks and I am guessing they're just going to say that my dates are wrong. Has this happened to anyone else and everything has turned out ok? Add a comment. I have been told your measurement date can be anywhere from 2 weeks in front or behind and be normal.

Not every baby grows the same. I'm currently measuring 1 week behind and Ob said that's nothing to worry about this early on I'm 20 weeks almost Hi my dates were two weeks different. Not every cycle is 28 days. Turns out my cycle that month had been 43 days.

It is very common and totally normal for ovulation dates to be all over the place. If bub has a heartbeat and is looking healthy that is the main thing.

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Try to relax and good luck :. They do ask what your cycle is, mine was 28 days. Thou when I had my 6 week scan, it came up that wriggle was due 4 days later than my dates. But since then the dates have moved back to closer to what i had as a due date.

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It is normal to ovulate early or late in a cycle cnd that would cause different dates, but I hear what you are saying So the sonography didn't measure right I would think. I had a scan last week and she measured bub while curled up with chin on body and then again stretched out snd it changed my due date by 5 days.

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