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Dating with the CRL can be within 3-4 days of the last menstrual period.
(Table) An important point to note is that when the due date has been set by an accurately measured CRL, it should not be changed by a subsequent scan.
Different babies of the same weight can have different head size, therefore dating in the later part of pregnancy is generally considered unreliable.
Missed abortions and blighted ovum will usually give typical pictures of a deformed gestational sac and absence of fetal poles or heart beat.A full bladder is often required for the procedure when abdominal scanning is done in early pregnency.There may be some discomfort from pressure on the full bladder.In such cases, it is reasonable to repeat the ultrasound scan in 7-10 days to avoid any error.The timing of a positive pregnancy test may also be helpful in this regard to assess the possible dates of conception.