Last Menstrual Period (LMP)
馃挕 Obstetric dates calculated from LMP using Naegele's rule (LMP + 280 days, or LMP - 3 months + 7 days + 1 year).
Calculate Pregnancy Dates -
Estimated Due Date (EDD)
Trimesters:
📚 Evidence & Guidelines
Class I Recommendation
★★★★★
(2014)
Citation: American College of Obstetricians and Gynecologists. Method for estimating due date. Committee Opinion No. 611. Obstet Gynecol. 2014;124(4):863-866.
Guideline: ACOG Pregnancy Dating Guidelines
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⚠️ Medical Disclaimer For dating purposes. Ultrasound for confirmation.