There is a 12 day difference in due dates ultrasound confirms an earlier date and LMP is a later date Which is more accurate?

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I go by the LMP, but even then I had mine early.
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How accurately can an ultrasound determine the date of conception?

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 ( 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 ( 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 ( Full Answer )

How accurate are due dates predicted by ultrasounds?

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 ( 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 ( Full Answer )

Is the EDD given to you on your scan date from your LMP or by the date of conception?

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 ( 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 ( 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 ( Full Answer )

Is an ultrasound more accurate in dating of pregnancy especially if you do not know your LMP?

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 ( Full Answer )

How accurate are the fetal measurements in determining you due date?

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 ( Full Answer )

How accurate are the ultrasounds for dating a pregnancy?

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 ( 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 ( Full Answer )

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 ( Full Answer )

How incorrect of a due date can an ultrasound show?

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 ( Full Answer )

Can the due date estimated from an ultrasound be off by four weeks?

\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. \ ( Full Answer )

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 ( Full Answer )

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 ( Full Answer )

How accurate is 6 and 12 week sonogram for due date?

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. ( Full Answer )

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 ( Full Answer )

Does pregnancy begin with lmp or ovulation date?

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 ( Full Answer )

How accurate is the ultrasound due date?

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.

Can a ultrasound be wrong about a due date?

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 ( Full Answer )

Is absolute dating more accurate than relative dating?

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 ( Full Answer )

Is your LMP date is when you got pregnant?

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 ( Full Answer )

How accurate is a due date calculator?

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 ( Full Answer )

How is relative dating more accurate?

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.