What is LH?
triggers ovulation
LH triggers ovulation in women and stimulates testosterone production in men. With FSH it gives a complete view of sex hormone regulation.
The mid-cycle LH peak triggers ovulation. A high LH compared with FSH is often seen in PCOS.
Test facts
- Unit
- IE/L
- Sample
- Serum
- Fasting
- No fasting needed
- Turnaround
- 2 days
What does low LH mean?
Low LH can suggest pituitary disease.
What does high LH mean?
High LH appears with menopause or ovarian or testicular failure.
Panels that measure LH
- Female Annual
- Female Hormones
- Hormone+
- Perimenopause
- Pre-Conception
More markers in the same area
Launching in Stockholm in 2026.
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This is general information about the marker, not an assessment of your values and not medical advice. Last updated: May 2026.