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Scan measurements Lock Rss

Are all measurements taken at a scan only an aproximate??? Sorry it may be a silly question.... We have had a scan this week and bub is measuring nearly two weeks ahead with height.... I feel I am having a giraffe!!

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Are all measurements taken at a scan only an aproximate??? Sorry it may be a silly question.... We have had a scan this week and bub is measuring nearly two weeks ahead with height.... I feel I am having a giraffe!!

Yes, my sonographer said theres 10-20% room for error either side. As baby gets bigger and the measurements get bigger the room for error is greater.

Does that make sense?
I was told the same thing about 10-20% room for error.
I hope there was an error, because the measurements at my 20 week scan put bub at 21w6d when it was only 20w1d. I thought I was growing a giant! LOL!
Anyway, I'm going back this week for a repeat scan because they couldn't get all of the measurements smile


Yes, have heard of some huge variances. I think they try and make an educated guess based on the scans, your fundal height, previous hx of large/small baby, medical issues like GD and genetic factors. They have not yet come up with a very accurate way to determine birth size. I was told at 26 weeks that my baby was measuring small for gestational age, that she would be "lucky to reach 6lbs" but she was 8lbs 4oz - so they were about 1kg wrong!

10 - 20%... if you ended up with a 3.5kg baby, that makes a variance of 350 - 700 gram either side, so you could have had a baby weighing anything from 2.8kg - 4.2kg!




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My bub is measuring a few days smaller than my dates confirmed. So they aren't 100% accurate as far as I'm concerned.
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