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Luteinizing Hormone (LH)

Published: July 27, 2026Updated: August 25, 2026

This biomarker measures the level of luteinizing hormone, which plays a crucial role in reproduction by stimulating ovulation in females and testosterone production in males.

Quick summary

LH is essential for reproduction and its levels indicate reproductive health.

Medically reviewed by WellAlly Editorial TeamLast reviewed August 25, 2026Editorial policy

Key facts at a glance

Units
mIU/mL
Clinical utility
diagnostic
Result kind
quantitative
FDA-cleared
Roche LH, Abbott LH, Siemens LH, Beckman LH
interpretation: {"text":"May indicate pituitary or hypothalamic disorders, or could be due to malnutrition or stress.","label":"Low LH"}; {"text":"May suggest menopause, primary ovarian failure, or polycystic ovary syndrome (PCOS) in females, and Klinefelter syndrome or pituitary tumors in males.","label":"High LH"}

Luteinizing hormone (LH) is a crucial hormone produced by the anterior pituitary gland. It is vital for regulating the menstrual cycle in females and for the production of testosterone in males.

In females, a surge in LH levels triggers ovulation, making it a key marker for assessing fertility. In males, LH stimulates the Leydig cells in the testes to produce testosterone.

Abnormal LH levels can indicate conditions such as polycystic ovary syndrome (PCOS), hypogonadism, or pituitary disorders. Monitoring LH levels is essential for diagnosing and managing reproductive health issues.

Frequently asked questions

What is a normal LH level?
Normal LH levels range from 1.7 to 8.6 mIU/mL, but can vary depending on age, sex, and reproductive status.
How is LH tested?
LH is typically measured through a blood test, often taken at specific times during the menstrual cycle for females.
  1. 1
    Mayo Clinic - Luteinizing Hormone (LH) TestSource
  2. 2
    American Association for Clinical Chemistry (AACC)Source

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

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Medically reviewed by WellAlly Editorial Team Last reviewed August 25, 2026. · Read our editorial policy