That can a dating ultrasound be off by 3 weeks apologise, but, opinion

When we used ovulation tests, I ovulated around day 19, not I think that's pretty normal. More Green For Less Green. Log in. My account.

An obstetrical ultrasound can be as much as weeks off, before or after the due date. Asked in Ultrasounds Can a ultrasound be wrong about a due date?

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Yes, the ultra sound measures the head and a forearm. Depending on the size is how they come up wth your conception date and due date.

If you are in the early stages of pregnancy &-8 weeks it will only be off by a day or two. By twelve weeks may be 3 days, 18/20 weeks days. From then . Sep 04,   hey just wondering can early ultrasound be off by 2 weeks when they measure a fetus. like i had an ultrasound done at 9 weeks cause we did not no how far along i was and did not no when my lmp was the measurements of the fetus in weeks fall on the 24th of dec. and then had another ultrasound at 10 weeks cause i had abit of spotting and again measurement of . 5 ? weeks gestation means 5 ? weeks from the first day of the last menstrual period, which is usually about 3 ? weeks from the date of conception (confusing, isn't it!) 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.

Your due date is typically 2 weeks before or even 2 weeks after. As if they'd know!

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This gave me a diffenrt estimate on both ends, putting me at 4 weeks off either way. Asked in Ultrasounds If an ultrasound showed you were 7 weeks and 5 days pregnant can you count back to see when you conceived?

Yes, though conception can occur at irregular times during a cycle.

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Typically, two weeks into your cycle you are able to conceive. Your due date is calculated based on the date your last period ended because it is impossible to determine precise conception datestherefore a woman at 7 weeks 5 days conceived approximately 5 weeks 5 days ago. Fetal measurements can also be off for your specific child, though.

I went in for my first ultrasound yesterday expecting to be 8 weeks 2 days, and was then told I was measuring 5 weeks 3 days. This is my first pregnancy, so naturally I was/am very concerned, however, it seems like this happens a lot!! I had also just come off of . Aftere having had two healthy babies and one miscarriage, I have found ulrasounds to be extremely accurate in dating a pregnancy. My OB is now . Based on my lmp my due date should have been 3/2 and we had sex around the dates that would have made sense with possible conception/ovulation etc. but my ultrasound was too early, they freaked me out that it was doomed bc there was nothing to be seen, then I went back weeks later and they found a healthy baby and heart beat measuring 7w5d so.

Mid September. However if you really meant you had your baby at term June 6 rather than that is the date an early ultrasound gave you then it might be off by 3 weeks either way as you cannot calculate backwards as accurately as healthy babies can be born any time from weeks after conception.

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Asked in Ultrasounds, Trimesters Can an ultrasound be off by a month in the first trimester How accurate is an ultrasound at 7 weeks? Well I had an ultrasound at 13 weeks and it was not very accurate. Oh by the way, depending on what kind of insurance you have and what hospital you are at you may not get another ultrasound.

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An ultrasound at 7 weeks is extremely accurate, within days. At 13 weeks it will be accurate within about 5 days.

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It can certainly not be off by a month. Asked in Pregnancy, Ultrasounds, Conception Dates At 18 and a half weeks pregnant can an ultrasound read at 20 weeks what would be the reason Is the baby big can an ultrasound be off by 10 days? At this stage, yes the ultrasound can be off by 10 days.

Mine was off by ten days the other way, that is I thought I was 18 weeks and the ultrasound said 16 and a half. I knew when I had conceived because my husband had been away on a trip. Asked in Periods while Pregnant, Periods and Conception Does ultrasound establish fetal age conclusively when there's question about a false period during pregnancy and hence about the date of conception? Unfortunately no You will probably find also, that as the baby grows, the estimated "date of arrival" will also vary upto a week or so either side, because the speed of growth of the baby can differ from one pregnancy to the next and they use these measurements to determine this.

The closer it gets to delivery date, the easier it becomes supposedly! Asked in Ultrasounds, Conception Dates Would excessive drinking the first trimester alter the measurements of ultrasound to determine size and conception date And if so how many days off could it be? NO ultrasounds measure amniotic fluid and the fetus head, this would not alter you're conception date. If you wanna know you're conception date go to www.

Apr 19,   Had an ultrasound on feb 16th that said I was 5 weeks 5 days and there was no fetal pole, and one on March first that said I was 6 weeks 2 days and the fetal pole was present as well as a heart beat. I'm trying to figure out HOW many weeks off can these ultrasounds be, and what time I approximately conceived, between when and when. How accurate are these early .

It's just an estimate. GOd bless.

Can a dating ultrasound be off by 3 weeks

Asked in Miscarriages, Ultrasounds, Due Dates If your due date from your period differs from your ultrasound due date does that mean high risk of miscarriage? No, it does not mean that you are in high risk of a misscarriage. The Doctor will normally give a due date with an ultrasound but with a variable of 2 weeks before or after the due date. No worries! Thank you! I also did some other research, and i guess since I just came off the pill, that could have thrown off my ovulation for that month, which could throw off my due date.

Asked in Ultrasounds, Planet Mars, The Moon What would be the most logical reason that a baby would measure 4 weeks ahead on an ultrasound and can a scan be that much off? You may have ovulated in a different day than you thought, implantation may have taken longer than with some women, the ultrasound's measurements just might be off a bit, or your itty bitty was just about to do some growing before the pic was taken, etc.

He was 1 day off at 6 weeks and 5 days off by 7 weeks. Even by that early point, ultrasound can be off by 1 week, plus even healthy itties can grow at their own rate.

Plus, doctors can mess up on clicking the buttons. It is an imprecise science. CraftyKayla member. I wouldn't worry!

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I have long cycles. I charted with FF and measured 5 days behind at my first ultrasound so I left really nervous and freaked out even though I saw a heartbeat. I went back today 3 weeks later and baby measured spot on with FF.

My OB said that babies just grow at their own little rates and there is room for error on their machines. Try not to worry, I know not stressing is easier said than done though! AJKayakMomma member.

How accurate are ultrasounds in determining the size of a baby?

Three days is nothing, I was off a week. It is very hard to hear that you are measuring earlier than you expected.

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Tech said it would be better towards the end of the pregnancy to ensure the baby was fully developed. She said it much better. Since the lungs are the last to develop it is better to be off behind then ahead. A big thank you to all of you ladies for your positive comments and stories. No one logged in. Dating and viability What is a dating scan?

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 gestational age is estimated unusual features of the uterus such as the shape or the presence of fibroids How is it done? For transvaginal ultrasound you can have an empty bladder When is it recommended?

not clear

For example if you do not know when the first day of your last period, or the likely day of conception was have had irregular periods have had an unusual cycle because you recently stopped the oral contraceptive pill, or you recently had a miscarriage, or you are breast-feeding had some implantation bleeding which can be been confused with your last period date What can be seen? This is presuming that the pregnancy is actually at this stage of development.

Sometimes a trans-vaginal examination shows that your pregnancy is less advanced than expected.

We did IUI + trigger with DS, so there was zero question of dating. He was 1 day off at 6 weeks and 5 days off by 7 weeks. Even by that early point, ultrasound can be off by 1 week, plus even healthy itties can grow at their own rate. Ultrasound dating is based on averages. Plus, doctors can mess up on clicking the buttons. Feb 03,   If you conceived super late in your cycle, that alone could put you at 2 weeks ahead where they thought you were based on lmp, couple that with the u/s tech being a week off in their measurements (which is easy to do that early on because a fraction of a cm can change the gestational age by days) and that could explain it. Aug 13,   There are 2 cases. 1. The pregnancy is consistently off by 3 weeks. It is off at the (presumably) 9th week, it is off at the 39th week. This doesn't sound very alarming to me. One possible cause is that the pregnancy took place at a different date.

How accurate is the ultrasound examination? The earlier the ultrasound is done, the more accurate it is at estimating the baby's due date.


Also the fetus cannot bend and twist too much yet, so the length of the body is fairly constant. The scan or my dates - which should I believe? As the baby gets bigger, it starts to express its individual growth potential.

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