Luteinizing Hormone (LH) by Immunoassay (Serum/Plasma)

What Does LH Measure?

LH is crucial for triggering ovulation in women and stimulating testosterone production in men. In women, LH surges just before ovulation, signaling the release of an egg. In men, LH supports the production of testosterone by the testes. Abnormal LH levels can indicate issues with hormone balance, fertility problems, or conditions affecting the pituitary gland.

Why Might You Need This Test?

Your doctor may order an LH test to evaluate reproductive health, diagnose fertility issues, check for hormonal imbalances, or investigate symptoms like irregular periods, missed periods, or low libido. It’s also used in conditions like polycystic ovary syndrome (PCOS) or to monitor treatment for hormone-related disorders.

How Is the Test Done?

A blood sample is taken from a vein in your arm. The sample is sent to a lab where it’s analyzed using an immunoassay method to detect LH levels. You’ll typically fast before the test, but your doctor will provide specific instructions if needed.

What Are Common Results?

Results are compared to standard ranges for your gender and age. High LH levels may suggest conditions like early puberty, ovarian dysfunction, or pituitary tumors. Low LH levels could indicate hypogonadism, pituitary disorders, or other hormonal deficiencies.