Endocrinology

Luteinizing Hormone (LH)

Normal Range
Male: 1.2-8.6 mIU/mL; Female: Varies by cycle phase
Sample Type
Standard
Fasting
No
Unit
mIU/mL

LH is a gonadotropin produced by the anterior pituitary. In females, a mid-cycle surge of LH triggers ovulation and the development of the corpus luteum. In males, LH stimulates Leydig cells to produce testosterone. Within an endocrine panel (TFT, FSH, Prolactin), LH helps differentiate between primary gonadal failure and secondary (pituitary/hypothalamic) 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 fluctuate significantly based on the phase of the menstrual cycle. Single measurements are often insufficient for diagnosis. Biotin supplements can interfere with some immunoassays, and many medications (opioids, anticonvulsants, hormonal contraceptives) alter secretion patterns.

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)

View Range

24-Hour Urinary VMA

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17-Alpha Hydroxy Progesterone

View Range
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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