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[[File:Distribution_of_gestational_age_at_childbirth.svg|thumb|Distribution_of_gestational_age_at_childbirth.svg]] '''Estimated date of delivery''' (EDD), also known as the '''due date''', is a key concept in [[obstetrics]] used to predict the approximate date when a [[pregnant]] woman is expected to give birth. The EDD is typically calculated based on the [[last menstrual period]] (LMP) or through an [[ultrasound]] scan.

==Calculation Methods==
===Last Menstrual Period (LMP)===
The most common method to estimate the due date is by using the first day of the woman's last menstrual period. This method assumes a 28-day menstrual cycle with ovulation occurring on the 14th day. The formula used is known as [[Naegele's rule]], which adds 280 days (40 weeks) to the first day of the LMP.

===Ultrasound===
An [[ultrasound]] scan can provide a more accurate EDD, especially if performed in the first trimester. The [[crown-rump length]] (CRL) measurement is used to estimate the gestational age and, consequently, the due date.

===Other Methods===
Other methods include the use of [[pregnancy wheel]]s and [[online calculators]], which incorporate various factors to estimate the due date.

==Importance of EDD==
The EDD is crucial for monitoring the progress of the pregnancy and planning for the delivery. It helps in scheduling [[prenatal care]] visits, conducting necessary tests, and preparing for potential complications.

==Factors Affecting EDD Accuracy==
Several factors can affect the accuracy of the EDD, including:
* Irregular menstrual cycles
* Late ovulation
* Inaccurate recall of the LMP
* Variations in fetal growth

==Related Pages==
* [[Pregnancy]]
* [[Prenatal care]]
* [[Obstetrics]]
* [[Ultrasound]]
* [[Gestational age]]
* [[Naegele's rule]]

==Categories==
[[Category:Obstetrics]]
[[Category:Pregnancy]]
[[Category:Medical terms]]

{{Obstetrics-stub}}

Estimated date of delivery - Revision history

Prab: CSV import