WHAT DOES IT MEAN?
Start with the right question
Progesterone rises after ovulation in the luteal phase. The often-mentioned “day 21 test” is not appropriate for every cycle length. Timing should relate to the likely ovulation date and the clinical question.
What we consider in context
- Cycle length and estimated ovulation
- Progesterone measured at an appropriate luteal-phase point
- Other hormone tests only when indicated by the question
What one result cannot tell you
One progesterone value cannot identify the cause of PMS, fertility problems or fatigue. Medical review may be appropriate.
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Explore bloodwork analysis ↗Frequently asked questions
Is day 21 always the right testing day?
No. Testing should relate to the likely timing of ovulation.
Does progesterone change during perimenopause?
Ovulation and cycle patterns can change. Interpretation depends on life stage.
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Targeted testing when appropriate. Results in context. Practical next steps.
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