LH levels are typically reported in units such as international units per liter (IU/L) or milli-international units per milliliter (mIU/mL). In females, LH levels rise during the middle of the menstrual cycle, triggering ovulation. In males, LH stimulates the production of testosterone in the testes.

Measuring LH levels can be helpful in assessing fertility, monitoring the menstrual cycle, and diagnosing certain reproductive disorders. LH testing is commonly used in conjunction with other hormone tests, such as follicle-stimulating hormone (FSH), to evaluate the functioning of the reproductive system.