My dating scan is wrong why

The size of the baby correlates less and less with its age as time goes on.

Ultrasound examinations from 12 to 22 weeks are regarded as being within 10 days of accuracy (or up to 10 days earlier or 10 days later than the woman's calculated due date).

This is because the fetus is growing so quickly that there is a big difference in size from week to week.

Also the fetus cannot bend and twist too much yet, so the length of the body is fairly constant.

Wishing you all a lovely day x My understanding is it can only be wrong through two factors a) you do it too early (before 9 weeks) and male DNA does not show up, so you get a false female result- if you are definitly past 9 weeks (which I assume you are being on this board) then that is not a possibility so you're good on that count B) contamination of sample: taking a sample in a room with male DNA or not washing hands after touching a male, or a male handling the sample equipment can cause a false male result. So if the top one doesn't apply to you then you have a little girl :) congrats!!!!!

Of course there is the chance they misread or wrote down the wrong result but I highly doubt it.

Ultrasounds performed after 22 weeks gestation cannot be used to estimate the due date of the baby because the size no longer reflects the age very well.

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I'd be so devastated now I've been told my angel is having a sister! X I don't actually know anyone who has been given the wrong gender results after the harmony test but the fetal assessment centre where I went for it for baby no.3 changed to the genesis test (baby no.4) as they were getting some incorrect gender results...

the baby and its heart beat can be detected relatively easily with trans-abdominal and trans-vaginal examination.

This is presuming that the pregnancy is actually at this stage of development.

Ultrasounds performed during the first 12 weeks of pregnancy are generally within 3 - 5 days of accuracy.

The most accurate time is between 8 and 11 weeks gestation.

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