If the LMP of a woman is June 20, EDD as per Naegele's rule is?

Appeared in: IGNOU PB Bsc Nsg Entrance-2017

Explanation

Naegele's rule is a standard method for estimating the due date in pregnancy.
The formula is: First day of Last Menstrual Period (LMP) + 7 days – 3 months + 1 year.
Starting with the LMP of June 20, adding 7 days gives June 27.
Subtracting 3 months from June gives March.
Therefore, the calculated Expected Date of Delivery (EDD) is March 27 of the following year.

Option A: This date is the result of an incorrect calculation. It does not align with the standard application of Naegele's rule.
Option B: This date is incorrect. It may result from miscalculating the days or months, for instance, by subtracting 10 days instead of adding 7.
Option D: This date is incorrect. It might be calculated by adding months instead of subtracting them, or by another error in applying the formula.

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.
Calculating the EDD is a fundamental part of antenatal care. It helps in scheduling prenatal tests, monitoring fetal growth, and planning for delivery.
Naegele's rule is a useful and quick estimation tool but has limitations. Its accuracy depends on a regular 28-day menstrual cycle, which is not the case for all women.
For women with irregular cycles, unknown LMP, or those who conceived while on hormonal contraception, a first-trimester ultrasound measuring the crown-rump length (CRL) provides a more accurate EDD.

How to Approach the Question

First, identify the key information provided in the question, which is the Last Menstrual Period (LMP) date: June 20.
Recall the formula for Naegele's rule: EDD = LMP + 7 days - 3 months + 1 year.
Apply the formula step-by-step to the given LMP.
Step 1 (Days): Add 7 days to the date. 20 + 7 = 27.
Step 2 (Months): Subtract 3 months from the month. June is the 6th month, so 6 - 3 = 3, which is March.
Step 3 (Year): Add 1 year to the current year.

Concept Tested & Keywords

Concept Tested: Calculation of Expected Date of Delivery (EDD) using Naegele's Rule
Stem keywords: LMP, June 20, EDD, Naegele's rule
Lead-in keywords: BEST, MOST RELEVANT CLUE
Negative lead-in flag: false

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E6 Obstetrics Williams p. 19-35

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