There is a 12 day difference in due dates ultrasound confirms an earlier date and LMP is a later date Which is more accurate?
I go by the LMP, but even then I had mine early.
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Ultrasounds measure the size of the fetus to predict a due date and are usually very accurate, within two weeks, so I would safely assume that it would not be off by five weeks. You can ask your doctor, it won't be the first time he or she has answered that question,I promise. Also it depends on wh…en the U/S is. U/S before 12 weeks of pregnancy are very accurate, plus or minus 2 weeks. After that there are more varibles, babies grow at different rates so they are not as accurate. ( Full Answer )
Will an ultrasound scan date be accurate enough to determine who the father is if you have slept with 2 different men within a month?
Answer . No.\nThe only way to be absolutely certain of who the father is, is a paternity test.\nMost people still choose the standard blood test.\nDNA testing is 99.9% conclusive, but is more costly. \nUltrasound only indicates the growth and health of the fetus.\nA calculated guess can be made o…n the "age" but definitely not the paternity.\n. \n. ( Full Answer )
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 ha…ve thrown off my ovulation for that month, which could throw off my due date. ( Full Answer )
Answer . \nYour due date is always based off of the first day of your last period, regardless of whether you are on the pill or not. For example, if period was 5/9/06 as day one, your due date would be 2/12/07.
Answer . They are accurate within 2 or 3 days.. But this does not mean that you will have the baby on your due date.. Babies can be born any time between 37 and 42 weeks.. That is what midwives are taught anyway.. With my first my ultrasound said I was due 10 days after my period date but my …husband had been away on a trip form the day after conception!. Second time around the ultrasound agreed completely, and showed twins. (now 16). ANSWER . Your last known period date or the date of conception is a better predictor....as all babies are different & you may have an extrememly large or an extremely small baby for it's gestational age, and when compared against babies in the "norm" the due date could be way off. ( Full Answer )
Is it more accurate if your doctor gave you a due date of February 18 and said you were 21 weeks pregnant but an ultrasound showed you were 20 weeks and had a due date of February 25?
Answer . You may have had a longer cycle and become pregnant a little later than you thought. There is only a week between these 2 dates so it is not enough to worry about.\n. \nwith my first pregnancy, my dates said I was due on September 23rd and my scan said October 4th. I knew I had interc…ourse on January second, so I guess it just took a while to implant. \n. \nI didn't get a positive pregnancy test until February 3rd, which would be about right.\n. \nSecond time round my dates and scan were the same and I had a positive test on the day after my missed period.\n. \nThe only time it really matters is if you had sex with 2 men a week apart and need a best guess as to which is the father. ( Full Answer )
Answer . \nEDD is ESTIMATED. If done by scan is 38 weeks from conception.. Answer . An EDD is based on the LMP (last menstrual period) and not the date of conception. The ultrasound measurements are comparing the baby to the expected size of other babies at the same gestational age. The earl…ier the ultrasound is done in the pregnancy, the more accurate it will be.\n. \nHope this helps!\n. \nDr. B. ( Full Answer )
What is a fetus's gestation age and due date when the LMP is unknown and can you count back the weeks at a dating scan to see when possible conception occured?
Answer . \nWhen you have a dating scan the scanner compares the size of the fetus with the size of fetuses of known gestation.\n. \nThe gestational age assumes that the mother has a regular 28 day cycle and got pregnant 14 days before a period. the gestational age is calculated from this notion…al LMP. This is accurate in about 85% of cases.\n. \nIf you don't know your LMP and have been given an EDD/gestational age you need to take off 2 weeks to find an estimated date of conception.\n. \nthis website will help you.\n. \nhttp://www.genetree.com/about/conception-calculator.asp ( Full Answer )
If your LMP was Nov. 4 and 3 ultrasounds showed your due date as Aug. 11 and one said July 31 what are the chances you got pregnant the last week of September?
Answer . \nIt's not possible at all. If your last menstrual period was November 4, you would've conceived somewhere around November 18-21, if you generally have normal periods and ovulate on time. \n. \nThe general rule of thumb to determine a rough due date is to subtract 3 months from your LMP… and then to add 7 days. Since one due date is earlier, it is possible that you could've conceived around the third week of October and November 4 was implantation bleeding. That really is the earliest conception would have occurred.. Answer . \nWell even with the earliest duedate that they gave me the date conception still lays at nov 6th which maybe i was wrong and my last day of my period was the 4th who knows.. Answer . \nAnd also I had a day of spotting dec 5th and then it stopped and i took a test ( Full Answer )
Answer . Yes, During an ultra sound they measure the length of the baby, the limbs if visible, head circumference etc.. then calculate an expected delivery date.\n. \n Answer \n. \nAn ultrasound is accurate to within a couple of days if done at 8 weeks. At 20 weeks it is accurate to with…in a week.\n. \nAfter this babies grow at such diffeerent rates that it becomes increasingly less accurate. ( Full Answer )
Answer . \nThey are almost accurate. I was told my baby girl was due on 9th March. She came on the 7th, but looked at least 1-2 weeks overdue. I knew when my last menstrual period was but according to the ultrasound dates it was different. I would say in some cases they are pretty accurate, but …if you know when your last menstrual period was and when you had sex, your dates are better then the doctors. ( Full Answer )
You had an ultrasound and the baby was dating 26 weeks when in fact conceived 24 weeks and 5 days before based on your lmp you should have been 26 weeks 5 days was the measurement from your edc or Lmp?
Answer . At this stage there is so much variation in babies sizes that 10 days difference is not important. \n. \nEDC is based on LMP by the way, it may be adjusted at an early (before 12 weeks) scan, but not at 26 weeks..
My wife told her doctor she didn't know when her last mp was, so he sent her for an ultrasound! She lied, we just wanted 2 get an early ultrasound, and it was exact 2 the day and that was at 5 weeks 4 days! Our 1st baby measured within 5 days thru the entire pregnancy, and that was as early as 8 wee…ks and as late as 26! ( Full Answer )
You were told you conceived on one date by an ultrasound but your lmp tells a different story off by 7 days but than again your cycles are 24 days which is more accurate?
Answer . Hello.\n. \nI would go with the date the ultrasound gave you but ultrasound dates can be off by a few to 7 days.. Answer . \nBoth of them are right. \n. \nYou probably conceived somewhere between the two. Most women ovulate 14 days BEFORE the missed period, as you have a short c…ycle this would mean 10 days after your LMP which would account for 4 of the 7 days, and even early ultrasounds are only accurate to within 3 days.\n. \nThe exact date would only be important if there had been two different men, and even then you would need a paternity test as it would be impossible to tell with such close dates. ( Full Answer )
When it says that an ultrasound is most accurate at 12 weeks does that mean gestational age or the time since LMP?
Answer . \nThe earlier it is the more accurate it is whether from conception or from LMP, but if you say 12 weeks you mean from LMP.
When I had an 8 week scan i got a due date of 6 Dec however I found a diary which confirmed my last cylce was 6th Feb this would give me a due date of 16th Nov on a 35 day cycle Is the scan accurate?
Answer . \nA last period on 6th Feb with a 35 day cycle would give a due date of 20th November but this still gives a 16 day discrepancy at a very early stage when the scan should be accurate within 2/3 days. Put the date of your scan on the discussion section and I will try to help.\n. \nengl…ishangel. ( Full Answer )
If an ultrasound at 14 weeks showed your due date as Oct 2 and an ultrasound at 20 weeks showed the same but a 28-week scan gave a Sept 23 due date could you have conceived before Dec 12?
Answer . \nAbsolutely not. The later in pregnancy the less accurate the scan. The first two giving a due date of October 2nd will be correct and give you a conception date of around January 9th..
Ultrasound at 7w3d baby measured right on that date However ultrasound at 13w3d baby measured 10 days larger LMP only lasted 2 days and was super light What would be your explanation?
Answer . \nA 7 week ultrasound would be more accurate than a 13 week one especially if it agreed with your lmp. 13 week babies have plenty of room to move around and sometimes it is more difficult to measure accurately.
Answer . I believe that my due date from my ultrasounds were 2weeks wrong. They say i were due March 9th, but i believe i were due Feb 22nd. I ended up having my bub on March 7th and she looked well cooked. I would say they could be wrong but probably no more then 2 weeks either way of the date …they give you. You have 2 rememeber the date is only an estimate, if you know what day your last period was or when you last had sex, if your able to work out your own date i would say somewhere in between your date and the ultrasound would be the due date. ( Full Answer )
\n. \n Yes an U/S can be wrong \n. \n. \nIt depends on when your U/S was done. I had an U/S to date my last pregnancy, because I was not having periods due to birth control. My baby was small for gestational age and so the U/S showed him due later than he actually was. BY over 3 weeks.\n. \…n It depends on when your U/S was done \n. \nAn ultrasound done before 12 weeks is accurate to within 2 or 3 days. After that it becomes less and less accurate as your pregnancy progresses as obviously some babies grow bigger and faster than others.. ( Full Answer )
If you dont know your lmp and had ultrasound at 5 weeks 4 days how accurate are the dates they give you?
\n. \n Answer \n. \nvery accurate (within one or two days)- they tell this by several different things
At 34 weeks pregnant and they did your first ultrasound at 9 weeks but your not sure if your period date was right can they still tell you accurately when your due date is.?
Answer . most of the time at that point the dr can tell how far along you are by your size and size of the baby, but they could be wrong it happens all the time. if they do another ultrasound it will be accurate. with my daughter i had implantation bleeding , i knew it was because it was early a…nd very light and only lasted a day. but the dr set my due date with that counting as my last "normal " period. i knew she was wrong so i calculated it myself and i was right! i went into labor the day i had calculated my due date to be. sorry this is long i do have a point:) if you think the dr went by the wrong period time, keep his due date in mind, but also recalculate from when you think you got pregnant. maybe youll be lucky and your real due date will be earlier than you thought! good luck! hope this helps! ( Full Answer )
How do I know my accurate due date when based on my period it would be Jan 10 but an ultrasound says Jan 14?
Answer . ultrasounds are a better judge, in an ultasound it measures the baby to see how big it is and then it is fed into a chart that will tell you when the due date is, the chart is based off of what size the baby should be at that week and day.
Answer . for a due date in early october you have to conceive in early to middle january.
If your due date is April 3rd is there any way your conception could have occured on the 27th of June if an ultrasound confirmed you to be 6 weeks pregnant on August 10th?
Answer . Six weeks pregnant on August 10th gives a due date of April 3rd, a conception date of July 12th and a last period around June 28th. a scan at this early stage is very accurate..
What did i conceive if my due date is 3-12-08 and my cycles are 30-31 days long My lmp was 6607. Neg test on 630 and 704 but a positive on 707.?
If you are asking if you are pregnant I would say 99.9% yes. You should check with your doctor to be certain and then set up your first appointment.
How do you figure out the approx date of conception based on your due date your due date is sept 18th your pregnancy is not consistent with your lmp your ultrasound was consistent with your due date?
The closest thought I have would be to go back 40weeks, then forward 2 weeks. This thought is based apon the fact of your aprox due date and taking it back to to what would have been the first day of your last period and then the 2 weeks forward would be roughly your ovulation time frame. I think th…at would be the best estimate you could ask for.\n. \nbtu who really cares!!\n. \n. \n. \n. \nfor an advanced algorithm take a look at www.redbabybook.com ( Full Answer )
When figuring the due date by a sonogram, the doctor will measure the crown-rump length (CRL). The length of the embryo on the longest axis constitutes the crown-rump length. This is actually considered to be the best parameters to date the embryo. The accuracy of it is plus or minus 3 to 5 days.… A rough rule of thumb is that CRL + 6.5 = Menstrual Age in Weeks. That said, it doesn't matter what week the sonogram is taken to determine its accuracy, because it is based on the CRL measurement of the fetus. No matter what the length is (because it was done on different weeks of gestation) is will directly relate to the week of gestation and ultimately determine the EDD (estimated date of delivery). The EDD is just that, and educated guestimate (guess/estimate) and is not meant to be written in stone. When the due date has been set by an accurately measured CRL, it shouldn't be changed by a subsequent scan. If another scan done 6 to 8 weeks later says that you should have a new due date that is further away, they should not normally change the date. Instead, they should interpret this finding as that the baby is not growing at the expected rate. After more testing has been done to determine whether the baby is growing properly and there is no other cause for concern, then it is feasible that perhaps the original measurement of the CRL wasn't properly measured by the person operating the sonogram. In this case, the new date is the actual date (considering the new measurement had been measured properly). Keep in mind, however, when trying to figure your conception date that a full term pregnancy is considered to be 38-42 weeks, and that the accuracy of the sonogram being plus or minus 3-5 days. The date you actually give birth is directly related to the CRL and other factors of development of the fetus. Also, an egg doesn't become fertilized and implanted immediately after ejaculation. It can take up to 72 hours post-sex before that happens. By taking the due date you have been given, count back 40 weeks. The date you get is only a rough estimate of the date of conception. It could be off by about one week. The day you recall having sex should be within that week, either before or after the date you counted back to. Please note: This really gives you a two week timespan. Example: If the conception date you come up with is May 10 and you know you did not have sex that day, you could have potentially conceived that day (but that is kind of beside the point for the moment). You may have had sex anywhere from May 3 to May 10, or May 10 to May 17 and conceived up to 72 hours after you had sex in between May 3 to May 17. ( Full Answer )
First Day of Last Menstrual Period: September 21, 2007 . Probable Date of Ovulation: October 5, 2007 . Possible Dates of Conception: October 1 to October 9, 2007
Every ultrasound my due date changes but only a few days apart. I need to know exactly when I conceived because I was with more than one person and dont remember my lmp?
Due dates are only estimates... All you can do is count 38 weks back from the due date to get the best guess on when the baby was conceived.
You could but keep in mind that it could also very much change depending on how the baby is measuring at the midway ultrasound. Even then the due dates are just estimates!
If your girl friends lmp was dec 26 2007 and you when for a ultrasound found out she was 8 weeks along and gave a due date of Oct 20 2008 what would the conception date be she cheated Jan 11 2008?
from her lmp her due date should be Sep 30, meaning she should have conceived Jan 9, give or take 5 days. Her due date is 20 days off. meaning her lmp would be Jan 14. she should have conceived around January 29, give or take five days, if she due on the 20th. ultrasounds aren't always completely ac…curate though. if she is completely sure of her lmp there is a possibility that both of your sperms could have been inside her around that time. You need a DNA test. but from the ultrasounds due date if she didn't cheat after jan11 it's definitely urs... ;) Hmm tricky one. Working back from the due date doesn't result in a hard and fast conceived date as sperm can survive inside the human body for several days before firtalisation happens. However, December 26th through to January 11th is probably too long (sorry, didn't quite follow the dates). I would ask for a DNA test as it will answer the question once and for all. Or, don't ask for a DNA test and accept the mother & child whoever's it is... :( Answer From the dates you gave above that would just be impossible. If she was to be 8wks on Dec. 26/07 she would be due sometime in June/08 which would make conception in and around Oct./07 sometime. If her due date given was Oct. 20/08 and she was to be 8wks at the time of your ultrasound then that would make her have a baby 12months later. Your dates don't match up at all if she is to be 8wks at this time. You had better check all your information correctly. ( Full Answer )
What if my lmp started 10 20 2008 and by that my due date would be 07 28 2008 but by sonogram they say 9 24 2008 Why such a big difference?
\nWhy do you care it doesnt matter ur babys probly going to die anyway and so will u.
Doctors actually consider the first week of pregnancy to be the week of your menstrual period. The second week is when the sperm fertilizes the egg. Week 3 is when the egg splits into about 500 microscopic cells. Week 4 is the actual beginning stages of the development of the embryo and most likely …the week that you find out you are pregnant! -Kharrima I Agree with the Above. But Some people still believe it is EXACTLY 9 Months before they give Birth (Obviously Does not count for Premature or Overdue Babies. :) ) Though, My Mother's Doctor think it Is When the Embryo starts being made. -Poison2007 ( Full Answer )
February 12th 2010? Then your conception date would be roughly between Sunday May 17th 2009 and Saturday May 23rd 2009
hi Im also 7 weeks and 3 days DUE date is about in JULY 1
Can a ultrasound be accurate if its saying im now due 3 weeks later then they determined?
In the first 8 or 10 weeks, transvaginal ultrasound is very accurate, usually to within 2 or 3 days. After this time period, it becomes less accurate, varying up to 1 week if the ultrasound is performed late in the 2nd or in the 3rd trimester.
You cannot say that carbon dating is more or less accurate than radiometric dating since it is a form of radiometric dating
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. Your due date is typically 2 weeks before or even 2 weeks after. on a side note when I had mine done at 29 weeks they told me my first day of my last period was a …month after! As if they'd know! This gave me a diffenrt estimate on both ends, putting me at 4 weeks off either way. we'll see...... ( Full Answer )
No a Creidt Card Company cannot change the due dates to earlier dates. The law does not permit it.
If the start date of the last menstrual period was Monday, October, 26th 2009, then the most likely day of conception was November 9 th 2009.
If your last menstrual period was May 13, your ovulation should have been approximately between May 26 and May 28, which is when you likely would have conceived.
Short Answer: In many instances, absolute dating is considered more accurate than relative dating because it gives a specific time or age to an event or object but with an accuracy that varies with the particular technique and particular object. Relative dating gives one the ordering of events or… gives one the relative ages, i.e. object A is older than object B without saying the actual age of either. Long Answer: Asking if one approach is more accurate than another is not a well defined question. These techniques are not used separately and the value of each is enhanced by the other. Further, neither of them is a single technique. Dating with uranium isotopes is different than counting tree rings. There are no less than a dozen different radiometric techniques and these are but one area of the more general class of methods referred to as absolute dating. The value of each depends on the question. If I want to know whether or not the dinosaurs were made extinct by the collision of an asteroid or comet with Earth 65 million years ago, the question can not be answered by radiometric dating. The question first asks whether one event occurred before another, i.e. comet/asteroid before extinction. If radiometric dating says the dinosaurs went extinct 62 to 66 million years ago and a collision occurred 60 to65 million years ago, one can not answer the original question. Causality is a separate question not addressed by either technique. Relative dating may collect information about other related events, i.e. absence of other species in the fossil records after the iridium layer which indicate environmental catastrophe and that is not something you get from radiometric dating. If relative dating shows lots of dinosaurs before the iridium layer and none after, then relative dating has given information that radiometric dating could not. So, the real answer to the question is that the two approaches, relative age dating and absolute dating, are able to answer different questions and depending on the question, one approach may be more appropriate than another and when they can be used together that brings added value. More Background: Sciences such as geology, paleontology and archeology are very interested in identifying the age of objects found and these scientists sometimes use either relative dating or absolute dating to characterize the age of the objects they study. Before radiometric dating it was difficult to determine the actual age of an object. Few things other than tree rings actually count the passing of years. Radiometric dating, based on known rates of decay of radioactive isotopes in objects, allows a specific age of an object to be determined to some degree of accuracy. Relative dating is a scientific process of evaluation used to determine the relative order of past events, but does not determine the absolute age of an object. The circumstances of the object may allow one to say that one object is older than another without being able to assign a particular age to the objects. For example: If an archaeologist is studying past civilizations, the archaeologist may be able to say that in a particular location the ruins of once civilization were found to have been build on another and so the layers unearthed in an excavation convey the sequence of historical occupations without revealing the actual dates. If the archaeologist finds a sample suitable for carbon dating, then an absolute date may be assigned to an object. Similarly for paleontologists who find layers of fossils. By deducing which fossils are formed in the sequence of time, the periods when the particular fossilized entities existed can be arranged in order without the actual dates of when the fossils were laid down. Radioactive isotopes can also be used by a paleontologists to assign an age to a fossil in some cases and that is an example of absolute dating with radiometric methods. For geologists, it is similar. Looking at how rock formations are structured, a geologist may be able to say which rock was developed in which layer in a particular order but not be able to determine that actual geologic age of the layers. Geologists deal with the oldest of samples and radiometric dating with uranium is one of the few methods of absolute dating. ( Full Answer )
...continuing from above, you would have also had to have sex before the conception, am i right?
They consider your LMP (Last Monthly Period) to be the starting day of your last period, they track the 40 weeks of pregnancy from that, but no, it's not the actually day where you ovulated and got pregnant. You usually ovulate about 2 weeks AFTER your LMP so technically when you are "4 weeks pregna…nt" the baby is only 2 weeks. ( Full Answer )
Currently it is pretty reasonable, although not exact. I would give a fudge factor of a week one way or the other, particularly if you weren't having sex frequently.
Due date calculators are very useful in determining the approximate due date of a baby. Due date calculators use the date of the last menstrual period and calculates out 40 weeks to determine a due date. Most women give birth between 38 and 42 weeks, some due date calculators are great rough estim…ators of the time frame of birth. ( Full Answer )
I had two period in april lmp was april 27 i got an ultrasound scan and it said i was due jan 27 is that accurate?
If you have went to the doctor and they gave you a due date then itis right. They go off what you tell them.
Relative dating is not more accurate than absolute dating. Relative dating will, if done properly, give you an order sequencein time but it will not return any information about when somethinghappened unless there is other information that can be used toestablish a time frame.