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Is measuring the femur bone in an ultrasound an accurate way to give you an estimated time of conception?
Wiki User
∙ 18y ago
The best person to ask is the person doing the ultrasound. Having said that here are a few guidelines. Ultrasounds can give you a fairly accurate time for the length of the pregnancy. Before 10 weeks the measurement taken is crown-rump length, from the top of the head to the bottom of the spine. This is accurate to within 3-4 days. After about 12 weeks several measurements are taken, head circumference, head diameter and abdominal diameter as well as femur length and the results are plotted on a graph to compare with the estimated length of pregnancy. The earlier the measurements are taken the more accurate they are in assessing the length of the pregnancy.
Wiki User
∙ 18y ago
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Is an ultrasound more accurate in dating of pregnancy especially if you do not know your LMP?
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. An ultrasound is accurate to within a couple of days if done at 8 weeks. At 20 weeks it is accurate to within a week. After this babies grow at such diffeerent rates that it becomes increasingly less accurate.
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Is the EDD given to you on your scan date from your LMP or by the date of conception?
EDD is ESTIMATED. If done by scan is 38 weeks from conception. 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 earlier the ultrasound is done in the pregnancy, the more accurate it will be. Hope this helps! Dr. B.
Judging by an ultrasound at 8 weeks im due on March 14 which means i concevied on June 21. how accurate is the conception date i was with someone on June 14 and then with someone else the 17-22?
your conception date should be pretty accurate considering u had an ultrasound. you shouldv'e been ovulating around June 21st.
When it says that an ultrasound is most accurate at 12 weeks does that mean gestational age or the time since LMP?
The 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 did you get pregnant due is December 3?
I will assume you are talking about December 3rd 2011. If so, that makes your estimated conception date March 11th 2011. The estimated conception date is not always completely accurate. It is often wrong by a couple of days.
My date of conception was August 8 2008 so how far along am i?
As of September 19, 2008 (this Friday), you should be 8 weeks along. Gestation is calculated (at first) by counting forward from the first day of your last period, and date of conception is typically assumed to be 14 days (2 weeks) after that date. A more accurate date can be given by the Sonographer at your first ultrasound, by measuring the size of your fetus.
Can you get an accurate due date from vaginal ultrasound at 5 weeks?
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!
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How accurate is the ultrasound due date?
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) == 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.
If an ultrasound gives you a date of how far along you are is it possible you could have been pregnant 5 weeks ago and still had your period and the ultrasound be off?
The ultrasound doesnt give you the date. It is estimated by the days you give to the doctors to help, narrow down the date. The first day of your last period and how long you've missed help them in determining your conception date. The picture shows them an image of a fetus and they use that picture to say at what developmental stage the baby is in. Anything is possible.AnswerContrary to the opinion above, the ultaasound does give you an approximate date of conception. By comparing the results of millions of ultrasounds physicians can calculate the age of the fetus based on head diameter, bone length, and other measurements on the fetus. They are usually accurate to within two weeks of when you are due to deliver. Since some women have irregular periods, it is not always possible to calculate the date based on the first day of the last period. Trust the ultrasound! ANSWERI just wanted to add to the above answer. A patient's Last mentrual period is accurate if the patient has a regular mestrual cycle, but this is not the case for many women. Therefore, it is not the most accurate source for fetal age. Ultrasound is the most accurate dating tool for fetal age. The measurement of the embryo (crown rump length) up to 12 weeks gestation is the most accurate. The rate of growth of a fetus will be based on that early measurement for the remainder of the pregnancy. It allows physicians to monitor the growth of the fetus which in turn gives them an estimated due date as well as help them diagnose growth abnormalities such as IUGR (Intrauteriune growth restriction).
Can your conception date change if you give birth after due date?
A conception date can never be 100% accurate
Can a ultrasound be accurate if its saying im now due 3 weeks later then they determined?
Can a ultrasound be accurate if its saying im now due 3 weeks later then they determined?
What is something that is accurate?
Precision measuring tools such as micrometers are accurate
