Luteinizing Hormone (LH) Dosage or Measurement (Serum)

Why Might You Need This Test?

Your doctor may order an LH test to check for hormonal imbalances, evaluate fertility issues, diagnose conditions like polycystic ovary syndrome (PCOS), or monitor treatment for hormone-related disorders. It can also be used during pregnancy to assess ovarian function or in men to evaluate conditions affecting testosterone production.

What Does LH Do in the Body?

LH triggers ovulation in women by signaling the release of an egg from the ovaries. In men, it stimulates the production of testosterone in the testes. Low or high LH levels can indicate problems with the pituitary gland, ovaries, or testes.

How Is This Test Performed?

A blood sample is taken from a vein in your arm. The sample is sent to a lab where it is analyzed to measure LH levels. No special preparation is usually needed, but you may be asked to avoid certain medications or activities before the test.

What Are Common Reasons for Testing?

Common reasons include investigating infertility, diagnosing hormonal disorders, checking for signs of early menopause, or monitoring conditions like PCOS. Men may have this test if they have low testosterone or unexplained infertility.