GMCH Chandigarh - 2019
Obstetrics & Gynaecology
Medium
What could be the expected delivery date for the woman who got her last menstrual cycle on 20th April 2018?
Appeared in: GMCH Chandigarh - 2019
Explanation
- calculated using Naegele's rule, a standard formula for estimating the due date.
- The rule states: EDD = First day of Last Menstrual Period (LMP) - 3 Months + 7 Days + 1 Year.
- Given LMP is 20th April 2018.
- Calculation: April 20, 2018 -> Subtract 3 months = January 20, 2018.
- Then, add 7 days = January 27, 2018.
- Finally, add 1 year = January 27, 2019.
Why Other Options Were Wrong
- Option B: This option incorrectly calculates the month. Subtracting 3 months from April (the 4th month) results in January (the 1st month), not February.
- Option C: This option incorrectly adds 11 days to the LMP date instead of the standard 7 days as per Naegele's rule (20 + 11 = 31).
- Option D: This option is incorrect for both the month and the day. It incorrectly uses February instead of January and adds 7 days to the wrong starting month.
Related Visual
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 skill in antenatal care. It helps in scheduling prenatal visits, timing important screening tests (like for aneuploidy or gestational diabetes), and monitoring fetal growth.
- An accurate EDD is crucial for making decisions about managing post-term pregnancies and determining the timing of induction if necessary.
- What if the woman had an irregular menstrual cycle? Naegele's rule assumes a regular 28-day cycle. For irregular cycles, the EDD is less reliable. In such cases, a first-trimester ultrasound measuring the crown-rump length (CRL) is the most accurate method for dating the pregnancy.
How to Approach the Question
- Identify the key information provided in the question, which is the first day of the Last Menstrual Period (LMP): 20th April 2018.
- Recall the standard method for calculating the Expected Date of Delivery (EDD), which is Naegele's rule.
- State the formula for Naegele's rule: EDD = LMP - 3 months + 7 days + 1 year.
- Apply the formula step-by-step to the given LMP.
- Start with the date: April 20, 2018.
- Subtract 3 months: January 20, 2018.
Concept Tested & Keywords
- Concept Tested: Calculation of Expected Date of Delivery (EDD) using Naegele's rule.
- Stem keywords: expected delivery date, last menstrual cycle, 20th April 2018
- Lead-in keywords: What could be
Question ID
QULd4ZAFPYnxeZ_28v4BN2
Reference Book
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. 72-94
Practise the full GMCH Chandigarh - 2019
Attempt every question from this paper in a timed mock, then review the full solution for each one.
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