Ovulation normally occurs on which of the following days?

Appeared in: DSSSB 13 August 2024

Explanation

In a typical 28-day menstrual cycle, ovulation, the release of a mature egg from the ovary, occurs around day 14.
This event is triggered by a sharp increase, or 'surge,' in Luteinizing Hormone (LH) from the pituitary gland.
Ovulation marks the midpoint of the cycle, transitioning from the follicular phase (egg development) to the luteal phase (preparation for pregnancy).

Why Other Options Were Wrong

Option A: Days 1-5 constitute the menstrual phase, where the uterine lining is shed. Ovulation does not occur during menstruation.
Option B: Days 6-10 are part of the follicular (or proliferative) phase. During this time, an ovarian follicle is developing, but the egg has not yet been released.
Option C: Days 20-28 are in the mid-to-late luteal (or secretory) phase. If fertilization has not occurred, the corpus luteum degrades, leading to the onset of the next menstruation.

Related Visual

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Phases of the menstrual cycle and the timing of ovulation as background academic context rather than a clinical decision trigger.
Understanding the timing of ovulation is crucial for fertility counseling, natural family planning (fertility awareness methods), and scheduling treatments like in-vitro fertilization (IVF).
Nurses educate patients on tracking ovulation using methods like monitoring basal body temperature, checking cervical mucus, or using ovulation predictor kits that detect the LH surge.
What if the patient's cycle is 32 days long? The luteal phase is consistently about 14 days long. Therefore, ovulation would be predicted to occur around day 18 (32 - 14 = 18), not day 14.

How to Approach the Question

First, identify the core concept of the question, which is the timing of ovulation.
Recall the standard model of the 28-day menstrual cycle, which is the basis for most textbook questions.
Mentally divide the cycle into its main parts: menstrual phase, follicular phase, ovulation, and luteal phase.
Remember that ovulation is the midpoint event, occurring after the follicular phase and before the luteal phase.
In a 28-day cycle, the midpoint is day 14. Select the option that matches this key fact.

Concept Tested & Keywords

Concept Tested: Phases of the menstrual cycle and the timing of ovulation.
Stem keywords: Ovulation, 28-day cycle
Lead-in keywords: normally occurs
Clinical cues: 28-day cycle (indicates a standard reference timeline)

Question ID

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Reference Book

E6 Gynecology Williams p. 365-431

E6 Medicine Harrison 22e Part 2 p. 1034-1036

E6 Robert Boland, Marcia L. Verduin - Kaplan and Sadock's Comprehensive Text of Psychiatry-Wolters Kluwer Health (2024) (pp 1-16525 of 16525) p. 8369-8371

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