Earlier ultrasounds are more accurate in terms of predicting the due date, so that's why doctors will usually use the dates and measurements from the first ultrasound of the pregnancy as a reference. Doctors will usually keep the original due date (the one generated by the date of the last menstrual period) if the ultrasound due date is within that margin of error. If an early ultrasound gives you a due date that is more than 1.2 weeks away from what was expected, there is a good chance that everything is still fine. I always go off the later date that way I don't feel overdue as early. Verywell Family uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Certain educational activities may require additional software to view multimedia, presentation, or printable versions of their content. ~Ellissa born 1/4/05~ ~Daimon Born 5/7/07 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. Postgraduate Institute for Medicine is jointly accredited by the Accreditation Council for Continuing Medical Education (ACCME), the Accreditation Council for Pharmacy Education (ACPE), and the American Nurses Credentialing Center (ANCC), to provide continuing education for the healthcare team.The maximum number of hours awarded for this Continuing Nursing Education activity is 0.2 contact hours.Historically, dating pregnancies and calculating due dates were left to weekly pregnancy calendars. Medically reviewed by Brian Levine, MD, MS, FACOG There are so many variables after you period. Did you ovulate at the average date or did you ovulate earlier or later? ultrasound is more accurate because they measure the baby and that lets them know how far along you are better than you lmp date. The due date may be estimated by adding 280 days ( 9 months and 7 days) to the first day of the last menstrual period (LMP). but it usually only varies by a few days to a week. Here it's more likely your LMP is not more accurate due to the factors I mentioned above.They say that ultrasound due date varies 2 weeks before or after.My doc is going with my LMP because even though baby measured a wee but behind daddy doesn't live in the same zip code as me. I can't wait to see the next US next month to see if it's still the sameOk, thanks!
Thus, later in pregnancy, ultrasound measurements are more valuable for evaluating the baby's growth over time (compared with earlier measurements) than they are for predicting a due date. Assuming that the subsequent ultrasound shows the expected fetal growth for the time period between the scans, your doctor may revise your due date to match the first ultrasound's predictions. If the estimated due date calculated from the first ultrasound is different from the one calculated by LMP, the doctor will consider the due date from the ultrasound as more accurate. As an ultrasound technologist, I think I am credible enough to to answer this question. The sonographer took into account the date of my LMP adjusting for a 32 day cycle aswell as the size of bub. As long as repeat ultrasounds show consistent growth and no signs of problems, there is no reason to be concerned if your doctor Did you have sex right after you ovulated? Let Huggies give you a guiding hand through your 9 months of pregnancy with practical tools, articles, tips and advice to help you along your path to motherhood. Once the EDD has been established using the LMP and/or first accurate ultrasound measurement, it should be recorded in the medical record and discussed with the patient; Learn More – Primary Sources: ACOG/AIUM/SMFM Committee Opinion 700: Methods for Estimating Due Date If your ultrasound is off by just a couple days, they won't change your due date because in the early stages the measurement could be slightly off due to position of baby and/or placement off the measuring markers. Tap the button to learn more about ObGFirstYou are now leaving the ObG website and on your way to PRIORITY at UCSF, an independent website.
During the period from Dec 31 2017 through Dec 31 2020, participants must read the learning objectives and faculty disclosures and study the educational activity. ? These activities will be marked as such and will provide links to the required software. This action cannot be undone.Are you sure you want to delete your comment? Going by my LMP I am around 4.5 weeks...Find advice, support, and good company (and some stuff just for fun).
So the due date changes with each ultrasound? That software may be: Adobe Flash, Apple QuickTime, Adobe Acrobat, Microsoft PowerPoint, Windows Media Player, or Real Networks Real One Player.This educational activity may contain discussion of published and/or investigational uses of agents that are not indicated by the FDA. Verywell Family uses cookies to provide you with a great user experience. The u/s is most accurate, because it looks at and measures your baby's development, which is most telling about his or her age. While looking at this image, the technician takes some standard measurements from different angles and listens for a heartbeat. I went for my first ultrasound at 12 weeks this weekend , i know im 12 weeks since im always on time with my period and i knew when i ovulated. We strive to provide you with a high quality community experience. This is the method used by "pregnancy wheels". Feel free to buy additional CME hours or upgrade your current CME subscription planOne of the benefits of an ObGFirst subscription is the ability to earn CME/CE credits from the ObG entries you read. but it usually only varies by a few days to a week. with 1st my ultrasound due date was a week earlier than my lmp due date but she came on my lmp due date. My due date for LMP was 1/1/15 and my scan was 28/12/14. My lmp was july 20 which gives me the due date of april 27 & my ultrasound due date is june 5 which was when i was 6 weeks or so thats what it showed. But he's keeping the due date. with 1st my ultrasound due date was a week earlier than my lmp due date but she came on my lmp due date. As pregnancy progresses, the accuracy of an ultrasound for predicting due dates decreases.
Thus, later in pregnancy, ultrasound measurements are more valuable for evaluating the baby's growth over time (compared with earlier measurements) than they are for predicting a due date. Assuming that the subsequent ultrasound shows the expected fetal growth for the time period between the scans, your doctor may revise your due date to match the first ultrasound's predictions. If the estimated due date calculated from the first ultrasound is different from the one calculated by LMP, the doctor will consider the due date from the ultrasound as more accurate. As an ultrasound technologist, I think I am credible enough to to answer this question. The sonographer took into account the date of my LMP adjusting for a 32 day cycle aswell as the size of bub. As long as repeat ultrasounds show consistent growth and no signs of problems, there is no reason to be concerned if your doctor Did you have sex right after you ovulated? Let Huggies give you a guiding hand through your 9 months of pregnancy with practical tools, articles, tips and advice to help you along your path to motherhood. Once the EDD has been established using the LMP and/or first accurate ultrasound measurement, it should be recorded in the medical record and discussed with the patient; Learn More – Primary Sources: ACOG/AIUM/SMFM Committee Opinion 700: Methods for Estimating Due Date If your ultrasound is off by just a couple days, they won't change your due date because in the early stages the measurement could be slightly off due to position of baby and/or placement off the measuring markers. Tap the button to learn more about ObGFirstYou are now leaving the ObG website and on your way to PRIORITY at UCSF, an independent website.
During the period from Dec 31 2017 through Dec 31 2020, participants must read the learning objectives and faculty disclosures and study the educational activity. ? These activities will be marked as such and will provide links to the required software. This action cannot be undone.Are you sure you want to delete your comment? Going by my LMP I am around 4.5 weeks...Find advice, support, and good company (and some stuff just for fun).
So the due date changes with each ultrasound? That software may be: Adobe Flash, Apple QuickTime, Adobe Acrobat, Microsoft PowerPoint, Windows Media Player, or Real Networks Real One Player.This educational activity may contain discussion of published and/or investigational uses of agents that are not indicated by the FDA. Verywell Family uses cookies to provide you with a great user experience. The u/s is most accurate, because it looks at and measures your baby's development, which is most telling about his or her age. While looking at this image, the technician takes some standard measurements from different angles and listens for a heartbeat. I went for my first ultrasound at 12 weeks this weekend , i know im 12 weeks since im always on time with my period and i knew when i ovulated. We strive to provide you with a high quality community experience. This is the method used by "pregnancy wheels". Feel free to buy additional CME hours or upgrade your current CME subscription planOne of the benefits of an ObGFirst subscription is the ability to earn CME/CE credits from the ObG entries you read. but it usually only varies by a few days to a week. with 1st my ultrasound due date was a week earlier than my lmp due date but she came on my lmp due date. My due date for LMP was 1/1/15 and my scan was 28/12/14. My lmp was july 20 which gives me the due date of april 27 & my ultrasound due date is june 5 which was when i was 6 weeks or so thats what it showed. But he's keeping the due date. with 1st my ultrasound due date was a week earlier than my lmp due date but she came on my lmp due date. As pregnancy progresses, the accuracy of an ultrasound for predicting due dates decreases.