Check that any recommendations for induction are based on the most accurate assessment of your due date, not on LMP dating.Įven if you are genuinely post-dates, your chances of going into labour naturally increase with every day which passes: Sometimes a scan will suggest that your due date is actually later than the LMP date, but the revised date may not have been entered on your notes as your 'new' due date.
Ultrasound scans for dating are pretty accurate in the first trimester, but get less and less accurate Use this for dating a pregnancy (presuming it was carried out during theįirst half of pregnancy, when dating is most accurate)." Therefore if scan information is available, it is preferable to Suggests that the dating of pregnancy by LMP tends to overestimate the Is 9.5% according to dating by LMP but only 1.5% when dated by scan. "If we look at how many women end up going 2 weeks over their due date, it Post-term when assessed by ultrasound dates" "Most pregnancies undergoing post-term induction are not One very thorough study of over 24,000 pregnant women in the UK who had dating scans which were compared with their LMP date, found that:
If you have been charting your cycles or practising natural family planning you will know all about this - if not, see the links on dating your pregnancy for more info. This is not necessarily on a day when you had sex sperm can survive for up to four days, possibly longer, so the intercourse which resulted in conception could have occurred several days before the actual conception. So your most accurate way of dating the pregnancy is knowing when you ovulated. If your cycles are sometimes longer than this then there is a good chance that your due date is actually later than the 'standard' one.Ĭonception has to happen in the 24 hours after ovulation - you cannot conceive before your egg has been released, but the egg dies if unfertilized 12-24 hours later. Standard pregnancy dating based on your last period date (LMP) is only accurate if you have a 28-day cycle and you ovulated on day 14. Many pregnancies which are thought to be "overdue" are just inaccurately dated. The chances are that you will not actually reach 42 weeks anyway, as when the date of conception is known, this is quite unusual. Links on dating your pregnancy Are you really "overdue"?.What if you refuse induction of labour?."We'll book you in for a home birth, but if you go to 42 weeks you'll have to come in to hospital to be induced" "Overdue" - but desperate for a home birth?
0 kommentar(er)
