LMP is 15-1-2017. What is EDD or Expected Date of Delivery?

Appeared in: AIIMS Raipur NO - 2017 (Shift-1)

Explanation

Naegele's rule is the standard method for calculating the Expected Date of Delivery (EDD).
The rule involves adding 9 months and 7 days to the first day of the Last Menstrual Period (LMP).
Given LMP is 15-01-2017.
Calculation: 15-01-2017 + 9 months = 15-10-2017.
Then, 15-10-2017 + 7 days = 22-10-2017.
Therefore, the correct EDD is 22nd October 2017.

Option A: This date is incorrect. It may result from a miscalculation, such as adding 14 days instead of 7 to the date after adding 9 months.
Option B: This date is incorrect. It falls in July, which is only 6 months after the LMP, not the required 9 months. This suggests a significant error in applying the formula.
Option C: This is a duplicate of the previous option and is also incorrect for the same reasons. The month is wrong, indicating a misunderstanding of Naegele's rule.

Visual 1: Infographic - A step-by-step visual guide showing the calculation of EDD using Naegele's rule with a calendar illustration.
Visual 2: Diagram - A chart comparing EDD calculation by Naegele's rule versus ultrasound, highlighting the assumptions and accuracy of each method.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Calculating the Expected Date of Delivery (EDD) using Naegele's Rule as background academic context rather than a clinical decision trigger.
Accurate EDD calculation is crucial for scheduling prenatal appointments, performing timely screenings (like for aneuploidy or neural tube defects), and monitoring fetal growth.
It helps in planning for delivery and making decisions about interventions if the pregnancy goes post-term.
Nurses must educate expectant mothers that Naegele's rule is an estimation. An early ultrasound is considered the most accurate method for dating a pregnancy, especially for women with irregular menstrual cycles.

How to Approach the Question

First, identify the key information provided in the question: the Last Menstrual Period (LMP) is 15-1-2017.
Recall the standard formula used to calculate the Expected Date of Delivery (EDD), which is Naegele's Rule.
State Naegele's Rule: Add 9 months and 7 days to the first day of the LMP.
Apply the rule step-by-step: Start with the date 15-01-2017.
Add 9 months to the month component: January (1) + 9 = October (10). The date becomes 15-10-2017.
Add 7 days to the day component: 15 + 7 = 22. The final date is 22-10-2017.

Concept Tested & Keywords

Concept Tested: Calculating the Expected Date of Delivery (EDD) using Naegele's Rule.
Stem keywords: LMP, 15-1-2017, EDD, Expected Date of Delivery
Lead-in keywords: What is

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