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There are no specific measurements for the lateral ventricles at the 12-13 week scan. Instead, Using a subjective approach to assess ventricular anatomy. This is consistent with current research as no systemic approaches are currently used.
Ventriculomegaly and its prognosis is highly dependent on the underlying cause. It may be associated with both chromosomal and non chromosomal causes. Development may occur later in the pregnancy just as ventriculomegally may resolve as the pregnancy progresses.
Currently, suspected isolated ventriculomegaly at the 12 - 13 week scan requires further investigation by fetal neurosonography or tertiary referral.
Attached are some relevant articles.
https://link.springer.com/article/10.1186/s12884-016-0797-z
https://pubmed.ncbi.nlm.nih.gov/36588196/