Calculate the EDD (Expected Delivery) of antenatal mothers whose LMP (Last Menstrual Period) is 10 June 2024.

Appeared in: Raj. CHO -2025

Explanation

Naegele's rule is the standard method for estimating the Expected Date of Delivery (EDD).
The rule involves subtracting 3 months from the first day of the Last Menstrual Period (LMP), then adding 7 days and 1 year.
LMP: 10 June 2024.
Step 1: Subtract 3 months from June, which gives March (10 March 2024).
Step 2: Add 7 days to the date, which gives the 17th (17 March 2024).
Step 3: Add 1 year to the year, which gives 2025.

Option A: This date is incorrect. It would be the result if 9 days were added to the date instead of the standard 7 days.
Option B: This date is incorrect. It would be the result if only 5 days were added to the date instead of the standard 7 days.
Option D: This option indicates the question was not attempted. However, the EDD can be calculated using the provided information.

Visual 1: Flowchart - A simple flowchart illustrating the steps of Naegele's rule: Start with LMP -> Subtract 3 Months -> Add 7 Days -> Add 1 Year -> Final EDD.
Visual 2: Calendar Diagram - A visual showing a calendar, highlighting the LMP date and then counting back 3 months and forward 7 days to arrive at the EDD.

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.
Calculating the EDD is a fundamental skill for nurses and midwives in antenatal care. It helps in scheduling prenatal visits, screening tests, and monitoring fetal growth and development.
It is important to remember that Naegele's rule is an estimation based on the assumption of a regular 28-day menstrual cycle. The EDD may be adjusted based on first-trimester ultrasound findings, which provide a more accurate dating of the pregnancy.
What if the mother has an irregular menstrual cycle? In such cases, Naegele's rule is less reliable. The EDD would be primarily determined by an early ultrasound measurement of the fetus (crown-rump length).

How to Approach the Question

Identify the key information provided in the question: the Last Menstrual Period (LMP) is 10 June 2024.
Recall the formula for calculating the Expected Date of Delivery (EDD), which is Naegele's rule.
Apply Naegele's rule: Subtract 3 months from the LMP month, add 7 days to the LMP day, and add 1 year to the LMP year.
Perform the calculation step-by-step: June (6) - 3 months = March (3); 10 + 7 days = 17; 2024 + 1 year = 2025.
Combine the results to get the final date: 17 March 2025.
Compare your calculated answer with the given options to select the correct one.

Concept Tested & Keywords

Concept Tested: Calculating the Expected Date of Delivery (EDD) using Naegele's Rule.
Stem keywords: EDD, Expected Delivery, LMP, Last Menstrual Period, 10 June 2024
Lead-in keywords: Calculate

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Practise the full Raj. CHO -2025

Attempt every question from this paper in a timed mock, then review the full solution for each one.