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• Luteinizing Hormone is a hormone released by the pituitary gland, a small gland at the base of the brain.
• The hormone stimulates the ovaries to produce and release eggs each month during the menstrual cycle.
• The level of LH in the blood and urine is highest before ovulation.
• This increase in hormone level is sometimes called a ""surge"".
• If fertility drugs are given to stimulate ovulation, an LH test can help determine the best time for sexual intercourse.
• The LH test may also be used to determine when eggs are mature enough to be surgically removed from the ovary as part of the in vitro fertilization process.
• LH tests may also aid in the diagnoses of polycystic ovary disease, premature ovarian failure, and menopause.