The Luteinizing Hormone, LH, test measures the level of LH in your blood to evaluate reproductive health and hormonal balance. LH is produced by the anterior pituitary gland and plays a vital role in regulating the reproductive system in both women and men. In women, LH works alongside Follicle Stimulating Hormone to regulate the menstrual cycle. A surge in LH triggers ovulation, the release of an egg from the ovary. LH also supports the production of progesterone, a hormone essential for maintaining a healthy menstrual cycle and pregnancy. Because of this, balanced LH levels are critical for fertility and cycle regularity. In men, LH stimulates the testes to produce testosterone, the hormone responsible for sperm production, muscle mass, bone strength, and sexual development. Abnormal LH levels in men can signal issues with testosterone production or testicular function. When LH levels are too high or too low, it may indicate problems with the ovaries, testes, pituitary gland, or broader endocrine system. Measuring LH helps identify whether symptoms are linked to reproductive organ dysfunction or to hormonal signaling issues within the brain. What Is Included In This Test? This test includes: Measurement of Luteinizing Hormone, LH, levels in the bloodClear numerical results for clinical interpretation This test measures LH only and does not include FSH, estrogen, progesterone, or testosterone. Why Does This Test Matter? LH is a key hormone in fertility, puberty, and hormonal regulation. In women of reproductive age, abnormal LH levels may interfere with ovulation and menstrual regularity. Elevated LH levels may be seen in women who are not ovulating, in menopause, or in certain genetic or ovarian conditions. In men, high LH levels may suggest that the testes are not functioning properly, prompting the pituitary gland to release more LH in an attempt to stimulate testosterone production. Low LH levels may indicate a problem with the pituitary or hypothalamus. This test is also valuable in evaluating early or delayed puberty in adolescents. Abnormal LH levels can help determine whether puberty related concerns are caused by central hormone regulation issues or primary reproductive organ disorders. Understanding your LH level provides insight into reproductive function, hormone balance, and overall endocrine health, supporting timely diagnosis and appropriate treatment planning. Who Should Consider This Test? You may consider this test if you: Have irregular or absent menstrual cyclesAre experiencing infertilitySuspect ovulation problemsAre evaluating menopause or perimenopauseHave symptoms of low testosteroneHave early or delayed pubertyHave suspected ovarian or testicular dysfunctionHave genetic conditions affecting reproductive healthHave suspected pituitary or hypothalamic disordersWant to evaluate overall reproductive hormone balance Convenient, No-Appointment Testing To complete your test: Order online through our website Use the lab locator to find a nearby testing location Walk in; no appointment required Access your results securely in your HealthLabs.com account within one to three business days 110% Price Guarantee! If you find the same test for a lower price from a comparable provider, contact us. We not only match the price, we beat it by an additional 10 percent of the difference.