略語大辞典 [Med] 10 EDD expected date of delivery 出産予定日. 最終月経期間の第一日に280日を加算した日.expected date of delivery; or EDC(expected date of confinement); calculated by adding exactly 280 days tothe first day of the LMP(last normal menstrual period); calculated according to Naegele's rule, ie, add 7 days and 9 丸善「略語大辞典」JLogosID : 11873218