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Dating scan

(6 Posts)
Molly1001 Sun 13-Sep-20 12:58:50

Hi can anyone help please, how inaccurate can a dating scan be, like how many days/weeks can they be out x

OP’s posts: |
TH22 Sun 13-Sep-20 13:06:55

I suppose technically weeks if you have pcos/another reason for very irregular periods... if you can't pinpoint the exact date of your ovulation, then a dating scan could easily be out.

plixy Sun 13-Sep-20 13:19:24

How many weeks did the scan say you were?
If you have a scan at say 6 weeks the baby is tiny and so harder to measure. At this point they could be a week or so out. Not weeks.
If you have the scan at 12 weeks it is much bigger and easier to measure and is therefore quite accurate.

Molly1001 Sun 13-Sep-20 13:21:56

@plixy I had my first scan on the 4th April and I was 9 weeks 4 days I’m trying to work out when I conceived approximately would these dates be based on my lmp or my conception date?x

OP’s posts: |
plixy Sun 13-Sep-20 13:23:18

I just replied on your other post x

passthemustard Sun 13-Sep-20 13:24:29

A dating scan at 12 weeks is pretty accurate.

An early can scan is not quite so accurate. My 6 week scan matched my dates but my dating scan showed I was 5 days further on than I thought.

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