LH (luteinizing hormone) is made by the pituitary. It triggers ovulation in women and testosterone production in men.
- Normal range (adults)
- Men 1.7–8.6 mIU/mL (1.7–8.6 IU/L) · Women 2.4–12.6 mIU/mL (2.4–12.6 IU/L)
- Sample
- Blood
- Fasting
- Not usually needed
- Also called
- Luteinizing Hormone, Lutenizing Hormone, L.H, LH Level
LH normal range
| Group | mIU/mLConventional units: US, South Asia | IU/LSI units: UK, Europe, Australia, international |
|---|---|---|
| Men | 1.7–8.6 | 1.7–8.6 |
| Women | 2.4–12.6 | 2.4–12.6 |
In women, LH peaks just before ovulation and rises after menopause.
Your report may use either unit system; labs in the Gulf often print both. Ranges also vary slightly between laboratories, so the range printed on your own report is the one to go by.
Why is the LH test done?
It is checked for fertility, irregular periods, PCOS and menopause.
What does a high LH level mean?
High LH can indicate menopause, ovulation (a natural surge) or PCOS (often with an LH higher than FSH).
Common causes
- Mid-cycle LH surge (normal)
- Menopause
- PCOS
- Testicular failure
Diet and lifestyle tips
- For PCOS: cut sugar and refined carbohydrates, exercise and lose excess weight
What does a low LH level mean?
Low LH suggests reduced signalling from the brain.
Common causes
- Pituitary or hypothalamus problems
- Low body weight or excessive exercise
- High prolactin
- Hormonal contraception
Diet and lifestyle tips
- Eat enough calories and reduce extreme exercise if periods have stopped
When should you see a doctor?
LH must be interpreted with the cycle day and FSH.
Last updated
This page is for general education and is not a diagnosis. Normal ranges differ between laboratories, so always compare your result with the reference range printed on your own report, and discuss abnormal results with your doctor.