Calculate the Expected date of delivery (EDD) using Naegele's rule, if a woman's first day of last menstrual period was February 11th, 2018.

Appeared in: AIIMS Raipur NO - 2019 (Shift-1)

Explanation

Naegele's rule is a standard method used to estimate the due date for a pregnant woman.
The formula is to add 9 months and 7 days to the first day of the Last Menstrual Period (LMP).
An alternative calculation is to add 7 days, subtract 3 months, and add one year to the LMP.
In this case, the LMP is February 11th, 2018.
Adding 9 months to February 11th gives November 11th.
Adding 7 days to November 11th results in November 18th.

Option A: This date is an incorrect calculation and does not follow Naegele's rule.
Option B: This date is derived by adding only 9 months to the LMP (February 11th + 9 months = November 11th) but omits the crucial step of adding the additional 7 days.
Option C: This date is an incorrect calculation and does not align with the formula of Naegele's rule.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Calculation of Expected Date of Delivery (EDD) using Naegele's rule as background academic context rather than a clinical decision trigger.
Estimating the EDD is fundamental in antenatal care for scheduling prenatal visits, monitoring fetal growth, and planning for delivery.
It is important for nurses to understand that Naegele's rule is an estimation and assumes a regular 28-day menstrual cycle with ovulation on day 14. It is less accurate for women with irregular cycles.
First-trimester ultrasound is considered the most accurate method for dating a pregnancy and is often used to confirm or adjust the EDD calculated by Naegele's rule.

How to Approach the Question

First, identify the key piece of information provided in the question: the first day of the Last Menstrual Period (LMP), which is February 11th, 2018.
Recall the formula for Naegele's rule to calculate the Expected Date of Delivery (EDD).
The most common method is to add 9 months and 7 days to the LMP.
Apply the formula step-by-step: Start with February 11th.
Add 9 months to February, which brings you to November. The date is now November 11th.
Add 7 days to November 11th, which results in November 18th.

Concept Tested & Keywords

Concept Tested: Calculation of Expected Date of Delivery (EDD) using Naegele's rule.
Stem keywords: Expected date of delivery, EDD, Naegele's rule, last menstrual period, LMP
Lead-in keywords: Calculate

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