Lab • 5 min
LH/FSH ratio in PCOS: what it means
You might hear about an “elevated LH/FSH ratio” in PCOS. Here’s what that refers to, why timing matters, and a gentle habit to support rhythm.
Timing and context
- LH and FSH fluctuate across the cycle. For meaningful interpretation, labs are often taken in the early follicular phase.
- Some people with PCOS show higher LH relative to FSH; others do not. Symptoms and other labs help complete the picture.
What is the “ratio”?
It’s simply LH divided by FSH (using the same units). There’s no single “right” cutoff; different clinics use different conventions.
Always review your results with your clinician in the context of your cycle timing and symptoms.
One small step to support rhythm
Morning
Get 10–15 minutes of outdoor light within an hour of waking. Consistent light cues help anchor circadian timing, which can support cycle regularity for some.
Make it easy
- Pair the light exposure with something you already do (tea/coffee walk, school drop-off).
- Cloudy? Still counts — outdoor light is far brighter than indoor.
Educational only — not medical advice. Please work with your clinician for diagnosis and treatment.
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