Estimated date of delivery

Estimated Date of Delivery (EDD)

The Estimated Date of Delivery (EDD), also known as the estimated due date (EDD), is a critical calculation used in obstetrics to predict when a pregnant woman is expected to give birth. This date is important for monitoring fetal development and scheduling prenatal care.

Introduction

The EDD is used as a guideline to help expectant mothers prepare for childbirth. It is calculated from the first day of the woman's last menstrual period (LMP) or through ultrasound measurements. The most common method to calculate the EDD is by using the Naegele's Rule, which adds 280 days to the first day of the last menstrual period.

Ultrasound imaging is often used to refine pregnancy due dates.

Significance of EDD

Understanding the estimated delivery date is crucial for several reasons. It aids healthcare providers in monitoring the pregnancy's progression and identifying any potential health concerns early. It also helps in planning for the birth, including deciding on the type of delivery and preparing for any complications that may arise.

Determining Factors

Several factors can influence the estimated date of delivery, including:

• The length of the menstrual cycle
• The date of conception, if known
• Measurements taken during an ultrasound

Pregnant woman undergoing prenatal care.

Calculation Methods

Naegele's Rule

Naegele's Rule is a standard way of calculating the due date. It involves adding one year, subtracting three months, and adding seven days to the first day of a woman's last menstrual period.

Ultrasound

Early ultrasound measurements can provide a more accurate estimation of the EDD, especially when the LMP is not known or the menstrual cycle is irregular.

Adjustments

Adjustments to the EDD may be made based on fetal measurements taken during ultrasound scans in the first trimester, which are the most accurate in predicting the date of delivery.

External Links

• American College of Obstetricians and Gynecologists - Methods for Estimating the Due Date
• World Health Organization - Maternal, newborn, child and adolescent health

References

• "Pregnancy Due Date Calculator." American Pregnancy Association.
• "Ultrasound: Sonogram." American Pregnancy Association.

Estimated date of delivery Resources
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