Question:medium
Which of the following methods for assessment of female fertility during a menstrual cycle can best predict the timing of ovulation?
Which of the following methods for assessment of female fertility during a menstrual cycle can best predict the timing of ovulation?
Show Hint
BBT only tells you afterward; the LH surge tells you it is coming.
Updated On: Jun 24, 2026
- Basal body temperature (BBT)
- Fern test
- Spinnbarkeit phenomenon
- Hormonal study
Show Solution
The Correct Option is D
Solution and Explanation
Frame the choices as predictive versus retrospective and direct versus indirect.
Basal body temperature is the classic trap. The small temperature step up happens because progesterone is thermogenic, and progesterone only rises after the corpus luteum forms, so the chart tells you ovulation has already occurred. Useful for confirmation, useless for advance warning.
The ferning pattern and the Spinnbarkeit thread test both read cervical mucus, which thins and stretches under rising estrogen in the days before ovulation. They hint that ovulation is near, but they are subjective, depend on the examiner, and only give a rough window.
Hormonal study is the precise tool. The luteinizing hormone surge is the actual switch that releases the egg, and ovulation reliably follows it within about a day and a half. Measuring serum or urinary LH, alongside estradiol, lets you forecast the exact ovulatory day, which is why ovulation predictor kits are built around LH. Among the four, the objective hormone assay is the strongest predictor.
$LH\ surge \rightarrow ovulation\ in\ 24\ to\ 36\ hours$
\[\boxed{Hormonal\ study}\]
Basal body temperature is the classic trap. The small temperature step up happens because progesterone is thermogenic, and progesterone only rises after the corpus luteum forms, so the chart tells you ovulation has already occurred. Useful for confirmation, useless for advance warning.
The ferning pattern and the Spinnbarkeit thread test both read cervical mucus, which thins and stretches under rising estrogen in the days before ovulation. They hint that ovulation is near, but they are subjective, depend on the examiner, and only give a rough window.
Hormonal study is the precise tool. The luteinizing hormone surge is the actual switch that releases the egg, and ovulation reliably follows it within about a day and a half. Measuring serum or urinary LH, alongside estradiol, lets you forecast the exact ovulatory day, which is why ovulation predictor kits are built around LH. Among the four, the objective hormone assay is the strongest predictor.
$LH\ surge \rightarrow ovulation\ in\ 24\ to\ 36\ hours$
\[\boxed{Hormonal\ study}\]
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