Pregnancy dating based on conception
Interestingly, no recent studies were found examining the length of human gestation; however, past sources have reported data that suggest human gestation lasts up to 7 days longer than the presumed 280 days.
which suggest that Naegele's rule does not correlate reliably with the date of conception despite the accuracy of the reported LMP.
As technology advances and more and more women receive ultrasound testing in pregnancy, it remains to be seen whether Naegele's rule, regardless of its original inception, will continue to stand the test of time.
Disclaimer: This article is for information only and should not be used for the diagnosis or treatment of medical conditions.
prospectively studied women's recall of their most recent LMP and found their study participants' memories became significantly less accurate over time, even by as little as 3 weeks from the actual onset of their last menses.
Another more frustrating aspect to establishing an accurate EDD is the commonplace use of pregnancy wheels.
If problems occur you may be advised that delivering your baby earlier is the safest option.
For advice on recognising signs that you are going into labour, or for information on some types of pain relief in labour, follow the links.
attributed this unexpected finding to recall "rounding," which would most likely lead to overestimating the gestational age, especially when compared to early ultrasound dating. found a similar trend towards preferred LMP dates, also noting "15" to be the most commonly selected number.