The earlier a scan is done, the more accurate it is. As your first scan ties in with your LMP they are likely to use this one for giving you an estimated due date.
Registered User
The earlier a scan is done, the more accurate it is. As your first scan ties in with your LMP they are likely to use this one for giving you an estimated due date.
Registered User
They usually go by LMP unless the difference between in EDD from LMP and u/s is more than 10 days in which case they'll use the u/s. At least this is what was done by the OBs I worked on clinical trials with.
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