How far off can a Doctor be on a due date?

Question

My first day of my last period was june 6, 2006 which then my due date should be around the 15th or so but my doctor has me for the 23rd of march. I can't figure it out and if I went by his due date it wouldn't match up with june 6, 2006 it would be much later.

Answer 1

http://www.mydr.com.au/tools/pregnancy.asp
this due sate calender shows you due on march 13th.

http://www.pregnancywizard.com/trimesters-stages/pregnancyduedate-accuracy.php
Due Date Accuracy


A woman's due date is best determined if the woman knows the date of ovulation, and can better guess the date of conception. Most women, however, are unaware of this and must base due date calculations on their last menstrual period. No matter which it is based on, due dates are generally an estimate with room for error.

Due dates are calculated using Naegle's Rule, a formula first developed in 1812.. The formula for Naegle's Rule is (LMP+7 days)-3 days=due date; LMP being last menstrual period. Using Naegles Rule, the average gestation is 260 days from the last menstrual period, or 288 days total. Two-thirds of all babies are born within ten days of their predicted due date; eighty percent of babies are born thirty-eight to forty-two weeks after the last menstrual period.

There are, however, many variations. Caucasian mothers with no children should add fifteen days to their due date; Caucasian mothers who have children should add ten. African-American mothers generally have shorter gestations, as do Asian women; they should add eight and a half days. Other factors include the quality of prenatal care and other factors that can only be determined by doctors. When predicting a due date, the fetal heart rate should be considered as should the lung development. Doctors should also consider the first time the mother feels movement, and uterus size when measured during pregnancy. In general, once pregnant, an expectant mother should assume her baby will be born anywhere from two weeks before to two weeks after the predicted due date.

Answer 2

First day of last menstrual period: June 06, 2006
Estimated date of conception: Tuesday, June 20, 2006
End of 1st trimester (12 weeks): Tuesday, August 29, 2006
End of 2nd trimester (27 weeks): Tuesday, December 12, 2006
Estimated Due Date: March 13, 2007

Always go by your last period. Good luck and Congrats!
http://www.mybirthcare.com/calculator

Answer 3

well my last period is was july 6, and they put my due date down as april 13. mine is wrong because of the period being wrong, they think im 28 weeks this week but im actually closer to 31 weeks (i concieved about 3 weeks before they think i did.) anyway ur date sounds about right. plus they change it a little if u get an ultrasound and the baby seems bigger or smaller. they use the measurements to try to pinpoint a date thats better.

Answer 4

Gestation is 40 weeks. Count forward 40 weeks from June 6th and you will get your due date....plus or minus two weeks. Your doctor's estimate seems right to me.

Answer 5

usually 2 weeks either way. a due date is a good estimation not an exact science.

Answer 6

not sure my last period was 5-20 and im due 2-23

Answer 7

Doctor can be wrong but the ultrasound will figure out exactly how far along you are.

Answer 8

they say any where between two weeks early to two weeks later then that. good luck but once they see the ultersound they shoudl be right on about it.

Answer 9

they can be within a couple weeks either way normally.




but rarely are they ever off by more than 9 months. :)