Endocrinology

Luteinizing Hormone (LH)

Normal Range
Varies by phase: Follicular: 2.4-12.6 mIU/mL; Mid-cycle: 14.0-95.6 mIU/mL; Luteal: 1.0-11.4 mIU/mL; Male: 1.7-8.6 mIU/mL
Sample Type
Standard
Fasting
No
Unit
mIU/mL

Luteinizing Hormone (LH) is a gonadotropin produced by the anterior pituitary gland. In females, a mid-cycle surge of LH triggers ovulation and the development of the corpus luteum. In males, LH stimulates Leydig cells in the testes to produce testosterone. Within an LH and FSH Panel, it is essential for diagnosing primary vs. secondary hypogonadism, investigating infertility, polycystic ovary syndrome (PCOS), and evaluating pituitary disorders.

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Interactive
mIU/mL

Enter your lab result to see where you stand compared to the standard reference range.

Why Context Matters

LH levels are secreted in a pulsatile fashion; a single measurement may not reflect the average concentration. Furthermore, high levels of biotin (Vitamin B7) supplements can cause analytically false results in many LH immunoassays.

Lab ranges are statistical averages, not biological laws. "Normal" for a 20-year-old male isn't normal for a 60-year-old female.

Clinical References

Source-of-truth databases and clinical guidelines for Luteinizing Hormone (LH):

Research & Guidelines

Related Indicators

Thyroid Function Panel (Free T3, Free T4, TSH)

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24-Hour Urinary VMA

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17-Alpha Hydroxy Progesterone

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DR

Medically Reviewed by Dr. Binoy Babu, MBBS

Board Certified Doctor • 10+ Years Clinical Experience

Dr. Babu is a practicing physician dedicated to empowering patients with clear, actionable medical information. He founded 2opi to bridge the gap between complex lab reports and patient understanding, ensuring everyone has access to a reliable second opinion.

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