LH and FSH Testing: What These Hormones Tell Us About Male Fertility

Written by Kristy Beard, MSN, APRN, FNP-C — Board-Certified Family Nurse Practitioner and Founder of Elevate Health and Wellness, serving patients across the Gulf Coast in Gautier, MS and Foley, AL.

The Pituitary-Testicular Axis

Male hormone health cannot be fully understood by looking at testosterone alone. Testosterone production is regulated by a feedback loop involving the hypothalamus, the pituitary gland, and the testes — a system clinicians call the hypothalamic-pituitary-gonadal (HPG) axis. Two pituitary hormones — luteinizing hormone (LH) and follicle-stimulating hormone (FSH) — are the messengers in this system, and measuring them alongside testosterone provides critical diagnostic information that testosterone alone cannot.

What LH Does in Men

Luteinizing hormone (LH) is produced by the pituitary gland and travels to the Leydig cells of the testes, where it stimulates testosterone production. When testosterone levels are adequate, LH production is suppressed through negative feedback. When testosterone is low, the pituitary increases LH output to try to stimulate more production. This feedback relationship makes LH an essential diagnostic tool: a man with low testosterone and HIGH LH has primary hypogonadism — the testes are failing to respond to adequate pituitary stimulation. A man with low testosterone and LOW or normal LH has secondary hypogonadism — the pituitary is not sending adequate signals, which may indicate a pituitary or hypothalamic problem.

What FSH Does in Men

Follicle-stimulating hormone (FSH) in men targets the Sertoli cells of the testes and is essential for spermatogenesis — the production of sperm. Elevated FSH in a man with low sperm count suggests significant testicular damage or failure. Normal or low FSH with impaired sperm production points toward a central or obstructive cause. FSH measurement is therefore particularly important in men presenting with fertility concerns alongside hormonal symptoms.

How Elevate Uses LH and FSH in Men's Hormone Evaluation

At Elevate Health and Wellness, Kristy Beard, MSN, APRN, FNP-C includes LH and FSH as standard components of the men's comprehensive hormone panel — alongside total testosterone, free testosterone, SHBG, estradiol, prolactin, and thyroid function. This complete evaluation allows her to distinguish between primary and secondary hypogonadism, identify pituitary abnormalities that require specialist referral, assess fertility status alongside hormonal health, and make more precise, individualized treatment recommendations than testosterone measurement alone permits.

Ready for a complete men's hormone evaluation? Visit our Men's Health and Hormones page at Elevate in Gautier, MS and Foley, AL.

Sources: American Urological Association. Male Hypogonadism Guidelines. auanet.org. | Endocrine Society. Male Reproductive Endocrinology. endocrine.org.

This article is written by Kristy Beard, MSN, APRN, FNP-C, board-certified Family Nurse Practitioner and founder of Elevate Health and Wellness. Information provided is for educational purposes only and does not constitute medical advice. Please consult a licensed healthcare provider for personalized care.