The tendency for multiple gestations to be delivered earlier than singleton pregnancies should not be interpreted that multiples should be assigned an earlier estimated due date. Review by Mark Curran, M. How accurate is fetal biometry in the assessment of fetal age?. Am J Obstet Gynecol ;
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Original date given was 18 December but at the scan it was moved to 31 Dec. It just doesn't quite add up by my reckoning of when I think I ovulated and when I know we did the deed! Unless you have an early pregnancy scan most of you will be given your estimated due date at the week scan. Of course you have probably already used an online due date calculator. This is where you discover that your due date isn't based on the date you conceived, it's actually calculated from when your last menstrual period started your LMP. It's because it gives a definite date for health professionals to work with. There would be so many variables if it was calculated from when you think you conceived, especially as everyone's cycles are different and the fact that you don't necessarily conceive on the day you have sex!
Can your pregnancy scan give the wrong due date?
I honestly had my period on July 4. However, when I went for my first prenatal visit and the blood work came back my HCG level wasn't as high as it should be at seven weeks. The first prenatal visit was a couple of weeks ago. I was only testing around three or four weeks.
Sign In What is more accurate dating scan or lmp This pregnancy due date calculator will give you a rough idea of when your baby should be born if you know the date of the first day of your last menstrual period lmp , or have already had your first ultrasound scan, you can use this tool. Remember that the earliest sonogram provides the most accurate edd for a patient with an initial ultrasound after 18 weeks, if the gestational age is within 14d, then the sonogram confirms her edd if the sonogram ega is more than 14days from her initial date or if her lmp is uncertain, a second dating sonogram should be done in wks. Doctors give trusted, helpful answers on causes, diagnosis, symptoms, treatment, and more: If the levels are questionable, an ultrasound scan should be used to diagnose the pregnancy outcome ultrasound findings are much more accurate at diagnosing pregnancy viability after weeks gestation than hcg levels are guideline to hcg levels during pregnancy: Which date do you go by and which is the most accurate when the midwife goes by by lmp my due date is the 25th nov, but when i went for my scan the date next to edd is the 19th nov which do i go by and why have only had the one scan and always thought that the scan dating was more accurate thanks.