Test Overview
A luteinizing hormone test measures the amount of luteinizing hormone (LH) in a sample of blood or urine. LH is produced by the pituitary gland.
- LH helps regulate the menstrual cycle and egg production (ovulation). LH levels normally change with the phase of the menstrual cycle. This hormone goes up fast just before ovulation occurs, about midway through the cycle (day 14 of a 28-day cycle). This is called an LH surge. Luteinizing hormone and follicle-stimulating hormone levels rise and fall together during the monthly cycle.
- LH also stimulates the production of testosterone, which plays a role in sperm production.
Current as of: April 30, 2024
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