EDD by scan v EDD by dates/LMP

[Cariad007]

Has anyone else had a 9 day difference in their due date by scan and by dates? I was told 24 February when I saw the midwife at my first appointment and this was revised to 15 Feb at my 12 week scan. Which turned out to be a 13+5 week scan instead. I accepted this at the time but now that I'm coming up to my official due date I'm starting to worry a bit. If baby doesn't arrive within a week of my scan date then they'll want to talk about induction, which I am very against, especially as I've got a good idea of when I conceived. I know I don't have to consent to anything I don't want to, but could do without the stress if it came to that.

My partner and I are both fairly tall (5'9 and 6'4) so I'm wondering if our baby is just a bit longer than normal? My bump still doesn't look full term - I had to have a growth scan at 29 weeks and baby came out bang on average for measurements and then at 36 weeks I was measuring fine for dates. Yesterday I had to go to the hospital briefly and they measured my bump at 37cm, which is about 2 weeks behind what I should measuring (though I know bump measuring isn't an exact science!) though the midwife didn't think anything of it.

So I am dong everything I can to bring on labour but was just curious if anyone else had had the same happen to them and if so, which date the baby arrived closer to?

Hope I completely understand, so sorry for what you are going through. I was hysterical when I was waiting to be induced by day 14 and I was top of the priority list but had no bed or doctor (I was high risk with polyhydramnios so they needed a doc) and I knew how dangerous that was and so did they. I am sure they will monitor you all the time to ensure your safety and intervene as soon as they can. How over are you? I don't think Dino means to come across as insensitive to what you are going through but trying to make people realise its not a good idea to refuse induction based on your own ideas of your perfect birth and self diagnosis vs a scan and professional. Not wanting an induction because you've refused and putting your baby at risk is not a good way to go I have to agree. I also want you to know my baby was fine and is very healthy, as I'm sure will be the case for you. If you were showing signs of needing immediate intervention they would. Try and relax, and good luck to you xxx

OP, I am 100% certain of my conception date, and throughout my pregnancy I have raised my concerns with my doctors, midwives and the consultant. I wasn't too concerned until I went overdue.

At the dating scan my EDD was calculated 11 days later than the EDD according to my date of conception.
I discussed the following with my doctor yesterday:

• There is only one possible date of conception
• My baby has been at the higher end on all measurements (scan and tape) so he's within range but big
• My dating scan was after 14 weeks on my dates, but they calculated 13+1 when they moved the EDD. Dating scans are more accurate if done earlier, and must be done before 13+ 6 for the dates to be reliable (convenient )
• I am well aware of the dangers of a deteriorating placenta after 42 weeks

I am 40+7 according to my scan dates and 40+18 based on the only possible conception date, so I have been pushing for induction ASAP.

The doctor ran through the risks of induction, and their success rates (75%). He also said that women who have not delivered by 40+6 only have a 30% chance of delivering spontaneously (which obviously decreases by the day).
He explained how the egg can fertilise up to 12 days after intercourse and despite the baby being big(ish) he was more comfortable to stick with the scan date. He also said that the induction dates are frequently postponed when the ward is busy s

I am obviously gravely concerned about the risks to my baby (so I really appreciate helpful posts like Dino's ) but the doctor refused to authorise the induction.
You will be offered as much monitoring as you like if you choose not to have the induction, just to make sure the baby is doing okay.

I might be making too many assumptions, but I doubt the NHS would risk leaving women a day later than 42 weeks (or trust the scan dates 100%!) if the still birth risks were that high.

I don't think worrying about the deterioration of your placenta will do you any good, it certainly hasn't helped me.

hope, so many people on Mumsnet seem to think the 'induction is BAD' and the alternative is completely risk free. Sadly it is not.

Scan one put it 4 days earlier. Interestingly, baby arrived on original due date

I can see why you are concerned Hope but try and trust the doctors experience is correct and he's right to go with the scan but say you want to be monitored more regularly to give you peace of mind and dont stop telling them how you feel, you shouldnt have to be this anxious by now. Are you on the ward already? Had any sweeps? I've no idea what still birth rate is but I do know that medical professionals are always horrified by be going 16 days over even now, I'm just so thankful he is here safe and sound. I can't understand anyone refusing induction providing they are full term, it might not be what you planned but if medical pros are recommending something for baby's safety why would you refuse?

Also re measurements my bump was measuring off the chart and he was 9lb10 but not the 12lb chart suggested. My friends bump measured she was having a 7lb baby he was 10lb4. You shouldn't read too much into the growth chart I've never heard an accurate prediction from one.

I completely agree Blondebrunette, the measurements are so rough, there doesn't seem to be much science to it! Mine are always in different places, I think they must just write down what they're expecting to see a lot of the time.

I'm trying to relax now, and have booked induction for Friday and asked for monitoring tomorrow just for peace of mind. Yes, two sweeps but no luck. Thank you

Glad you've got a date Hope, and they are keeping a close eye on you. I had no luck with sweeps either with dc2 but induction wasn't bad at all-I actually had him really quickly from having waters broken which wasnt bad and didn't need the hormone drip in the end despite them preparing me for it so hope all goes great for you too. Take care of you and enjoy your lovely baby, such an exciting time :-). X

Scan dates tend to be more accurate, but they can still be out by +/- 7 days.

You don't have to be induced at 40 +10/12/14 (or whatever your particular hospital's policy is) - you can ask for daily monitoring as an alternative. Full term is 37-42 weeks so actually quite a big window.

A positive to induction you can often have epidural very early on, i heard which can be good compared to being sent home or refused even gas and air because you arent 4cm.
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