Naegele rule
Naegele rule (nay-gi-li) n. a method used to calculate the estimated date of delivery: nine months and seven days are added to the date of the start of the last menstrual period. A correction is required if the woman does not have 28-day menstrual cycles. [ F. K. Naegele (1777–1851), German obstetrician]
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Naegele rule