Doctor insights on:
Can Your Conception Date Be Off
To be specific, if the ultrasound dates 6 weeks, 3 days, and dates conception, is it possible for the conception date to be off by 8 or 10 more days?
Bit of a stretch: To be specific, are you further along or less far along than expected? Was fetal heart activity seen? If you are supposed to be 8 weeks and a 6 week 3 day size fetus is seen without fetal heart activity i would worry about fetal demise. In such a case i would repeat the ultrasound in a week and verify fetal life or not. ...Read more
When using the online calc to get conception date...Are those to the day if you knew your LMP and ultrasound dates match. How off can they be?
It depends : On how regular your cycles are. If regular then it could be +/- 2-3 days; if irregular it can be way off. ...Read more
If your ob tells you your edd is 03/12/14 according to your u/s. Can a conception calculator be used to find out an estimate conception date?
Not accurate: We frequently get this question when there is more than one possible contender to be the father. Sorry, it doesn't work that way because there is a margin of error in the u/s and there is no guarantee that you conceived exactly at day 14 which is what those calculators will assume. Best of luck. ...Read moreSee 1 more doctor answer
About 4 days: Early transvaginal ultrasound for pregnancy is accurate to about 3-4 days. The time for accuracy is from about 6 weeks to 12 weeks gestation. We count from the first day of the last menses for OB dating. We can see the pregnancy before 6 weeks but usually just the sac and adding the fetal pole makes things a bit more accurate. Best wishes. ...Read moreSee 1 more doctor answer
Do ultrasounds date from conception or lmp? I.E. If they say baby measures 12 weeks, is that from conception or should that date back to your lmp?
LMP: Dating is based on lmp as that is usually a measurable event. ...Read more
Us on 12/9 read 7wks due date 7/28 when did i conceive and how many days could the conception be off by? Any chance it could be off by 2 or 3 weeks
Calculator: Use a free online reverse due date calculator. Type in your due date and the conception date will be calculated for you. ...Read more
If you know your due date, what is a simple calculation that can be used to figure the conception date?
Look ahead: Look ahead 3 months (12 weeks) from due date and subtract one year. ...Read more
Is conception the actual day you conceived or the day the sperms met the egg? How many days can conception be off by?
Can a 6 wk(gestational) u/s be off by over a week, maybe two when trying to determine conception date?
U/S: A six week ultrasound can be "off" by perhaps a day. ...Read more
Is the fundal height supposed to be equal to LMP date? So you could figure two weeks behind as how many weeks you're actually pregnant?
Can help: Fundal height measurement can help to figure out in the ball park- the age of gestation. Gestation age measurement by lmp (only help if your period is regular and you know when is your lmp ) will help too, andobviously measurement using an ultrasound is the most accurate. Combination of those 3 will be the best. ...Read moreSee 1 more doctor answer
Internet options: There are quite a few websites that can calculate this. Here's just a couple: http://www.Justmommies.Com/duedate.Shtml http://www.Whattoexpect.Com/toolkit/duedatecalc/duedatecalc.Aspx. ...Read more
If my 8 and 12 week ultrasound gave me a due date of September 28th how accurate is the conception date and how far can it be off ?
Depends: The accuracy of the delivery date is variable depending on a number of factors. Usually the earlier scan is most accurate due to differences in gestational size (weight). However, the US is a predictor of age of the fetus not the delivery. The fetus could come early or late even if it is at the due date because labor is not exactly coupled to the fetal age. However, +/- 2 weeks is a good guess ...Read more
If someone had early ultrasound at six weeks determined conception date to be december 6, 2012 is that date accurate and how many days can it be off?
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