In a patient, LMP was 9 Jan 2017, then calculate EDD?

Appeared in: AIIMS Delhi NO - 2017

Explanation

The Estimated Due Date (EDD) is calculated using Naegele's Rule, a standard method in obstetrics.
The rule involves adding 7 days to the first day of the Last Menstrual Period (LMP) and then adding 9 calendar months.
Alternatively, one can add 7 days, subtract 3 months, and add 1 year to the LMP.
Given the LMP of 9 January 2017, adding 7 days gives 16 January 2017.
Adding 9 months to January results in October.
Therefore, the calculated EDD is 16 October 2017.

Option A: This date is incorrect. It results from adding 8 months instead of the standard 9 months required by Naegele's rule.
Option B: This date is incorrect. It results from adding 7 months instead of the standard 9 months.
Option C: This date is incorrect. It appears to result from adding 8 months and forgetting to add the 7 days as per Naegele's rule.

Clinical Relevance

Nursing practice connection: Use the key finding related to Calculation of Estimated Due Date (EDD) using Naegele's Rule to guide bedside assessment, documentation, and the next nursing action.
Calculating the EDD is a fundamental skill for nurses in antenatal care. It helps in scheduling prenatal visits, performing timely screenings, and monitoring fetal growth.
An accurate EDD is crucial for managing post-term pregnancies and making decisions about labor induction.
It's important for nurses to educate patients that Naegele's rule is an estimation and is most accurate for women with regular 28-day menstrual cycles. The actual delivery date can vary.

How to Approach the Question

First, identify the key information provided in the question: the Last Menstrual Period (LMP) is 9 January 2017.
Recall the formula for calculating the Estimated Due Date (EDD), which is Naegele's Rule.
Apply Naegele's Rule: Add 7 days to the LMP date and then add 9 months to the LMP month.
Step 1 (Days): 9 + 7 = 16.
Step 2 (Months): January (1st month) + 9 months = 10th month, which is October.
Combine the results: The EDD is 16 October 2017.

Concept Tested & Keywords

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E6 Comprehensive Textbook of Community Health Nursing for BSc Nursing Students Part 2 — Subpart A (pp 1-275 of 550) p. 195-197

E6 Obstetrics Williams p. 19-35

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