Ultrasound dating wrong? - July Babies | Forums | What to Expect
Now, your doctor says that date's all wrong. (An early ultrasound, usually done at about 6 to 9 weeks, can give the most accurate due date. Can your pregnancy scan give the wrong due date? Despite the fact that sonographers are experts in their field, estimated due dates (EDD) calculated from pregnancy scans can be incorrect, as Ollysmum76 discovered. “My due date got put back by 2 weeks at the 12 week scan. Have any of you had an ultrasound that dated your pregnancy incorrectly?I wasn' t If the weight can be so wrong, I'm assuming it can get due dates a little off.
The doctor said there was no point in changing the date since I was sure of my LMP and most people go over anyway so the date really just is a ball park measurement for when the baby will most likely be ready. Hooray for those stubborn children that like the extra week or two!
Why a Doctor May Change Your Due Date | What to Expect
Measurements can really vary depending on the angle of the baby at the time. And like a previous poster said after the first trimester babies really start growing at different rates so later ultrasounds are even less accurate in estimating fetal age. Ultrasounds in the first trimester can be off too.
I know exactly when this baby was conceived because I was on fertility meds and was charting very carefully and know exactly when ovulation occurred.
3 reasons why your due date is wrong
My first trimester ultrasound puts my due date at 4 days later. Which isn't a big deal, but I know that it's not as accurate as my due date based on ovulation date.
- Your first ultrasound was in the second trimester
- Social media
- What can I do?
And I'm ok with my "official" due date being a few days later, it means that I have a little more time before my midwife starts talking induction if I go past my due date like I did with my daughter. I had the NT testing and at that scan I measured another 4 days ahead of the last date.
Original due date was and now its so who really knows. I know they wont move the date after the second trimester though due to babies growing at different rates. Also I dont know how much stock I put in OB's trying to estimate birth weight at the end either.
With my first child although I had gained a lot of weight the OB said DD would be about 6 lbs or so but she was 9lbs! Experts say that the scan date can sometimes come out as less pregnant than suggested by your LMP. But then again with my first baby I was spot on with dates, he always measured big and he was a week overdue Babies are ready when they're ready - try not to worry easier said than done.
The healthcare professionals will stick to this date as far as possible because it is then used as the baseline for growth throughout pregnancy.
Your baby's growth can slow down and then have spurts.
Dating your Pregnancy | The MotHERS Program™
I've not even had my 20 week scan yet. I have scans every few weeks so it will probably keep on changing. My baby will come when it's ready anyway, maybe weeks before or maybe weeks after my due date.Can ultrasound aid in calculation of LMP if patient does not remeber it?-Dr. Teena S Thomas
These can be carried out from week 5 or 6 of pregnancy, which is a notoriously tricky time to be accurate on dates.
Measurements at such an early stage aren't accurate which is why they wait for 12 weeks to date you. We always recommend mums get a definitive dating scan closer to 12 weeks as this will be much more accurate.
Just half a millimetre at such an early stage can change your date by a week. Your week scan will be far more accurate.