Estimated date of confinement

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The Estimated Date of Confinement (EDC), also known as expected date of delivery/estimated due date (EDD) or simply due date, is a term describing the estimated delivery date for a pregnant woman.[1] Normal pregnancies last between 37 and 42 weeks.[2]

It is a calculated date (i.e., an estimation), determined by counting forward 280 days (40 weeks) from the first day of the woman's last menstrual period.[3]

Origins of the term[edit]

Confinement is a traditional term referring to the period of pregnancy whereby a woman would be confined to bed (in an effort to reduce risk of premature delivery).[citation needed] Except in threatened pregnancies (for example, in pre-eclampsia), this is no longer a part of antenatal care.


  1. ^ "Definition of Estimated date of confinement (EDC)". MedicineNet, Inc. Retrieved 13 January 2010. 
  2. ^ Durham, Janelle (2004). "How accurate is your Due Date?". Retrieved 13 January 2010. 
  3. ^ "Calculating Your Due Date". Healthline Networks, Inc. Retrieved 13 January 2010. 

See also[edit]