LH

The Luteinizing Hormone (LH) test is a blood test that measures the amount of LH, a hormone produced by the pituitary gland. LH works alongside follicle-stimulating hormone (FSH) to regulate the reproductive system in both men and women.

In women, LH is responsible for triggering ovulation—the release of an egg from the ovary—and helps regulate the menstrual cycle. In men, LH stimulates the testes to produce testosterone, which is essential for sperm production.

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Why the LH Test is Done:

In Women:

• To assess ovulation and fertility

• Diagnose causes of irregular periods or absence of menstruation (amenorrhea)

• Evaluate for polycystic ovary syndrome (PCOS)

• Help confirm menopause

In Men:

• Investigate causes of infertility

• Evaluate low testosterone levels

• Assess testicular function

In Children:

• Diagnose early or delayed puberty

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Sample Required:

• A blood sample drawn from a vein.

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Test Preparation:

• Usually no special preparation is needed.

• Women may be asked to test on specific days of the menstrual cycle for accuracy.

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What Abnormal LH Levels May Indicate:

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High LH Levels:

• Polycystic Ovary Syndrome (PCOS)

• Ovarian failure or menopause

• Turner or Klinefelter syndrome

• Pituitary gland disorders

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Low LH Levels:

• Pituitary or hypothalamic dysfunction

• Stress, malnutrition, or excessive exercise

• Failure to start or complete puberty

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Benefits of the LH Test:

• Helps assess fertility problems

• Monitors ovulation timing for pregnancy planning

• Aids in diagnosis of hormonal and reproductive disorders

• Supports puberty assessment in children

The LH test, especially when done alongside FSH, estradiol, and testosterone, provides a comprehensive view of reproductive and hormonal health. It’s an important tool in evaluating infertility, menstrual issues, and endocrine function in both sexes.