Lab test

LH Levels Blood Test - Luteinizing Hormone

This blood test measures luteinizing hormone (LH), a hormone made by the pituitary gland.

Typical price

From $49

Results

1-3 business days

Preparation

See preparation notes below

Sample

Blood draw or sample collection at a local center

This blood test measures luteinizing hormone (LH), a hormone made by the pituitary gland. In women, a surge of LH triggers ovulation in the middle of the cycle, and LH also supports the production of estrogen and progesterone. In men, LH stimulates the testes to produce testosterone. The test may be ordered to investigate irregular or absent periods, fertility concerns, suspected pituitary disorders, or symptoms of low testosterone, and it is often interpreted alongside FSH. Because LH changes with the menstrual cycle, results are assessed using sex, age, and cycle timing.

• Luteinizing Hormone (LH) A pituitary hormone that triggers ovulation in women and stimulates testosterone production in men.

• Women with irregular, absent, or difficult menstrual cycles
• Individuals exploring possible causes of infertility
• Men being evaluated for low testosterone or testicular function
• People with suspected pituitary or hypothalamic concerns

• Cycle timing matters in women; confirm the preferred collection day with your provider
• Report hormone medications or fertility treatments to the laboratory
• Follow any additional instructions that come with your order

LH is compared against sex- and age-specific reference ranges, with cycle phase considered in women. A high LH in women may be associated with reduced ovarian function, while in men a high LH can suggest reduced testicular response; low values may point toward pituitary or hypothalamic causes. Because LH works closely with FSH and the sex hormones, a healthcare provider should interpret the result in the context of the full hormone profile.

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