Management of Hypogonadotropic Hypogonadism

Diagnosis and Classification

Low FSH and LH levels with low testosterone indicate hypogonadotropic hypogonadism (HH), which can be congenital or acquired, according to the European Association of Urology 1
Morning serum testosterone measurements should be repeated to confirm low levels due to assay variability, as recommended by the American Urological Association 2
Distinguish between primary hypogonadism (testicular failure) and secondary hypogonadism (pituitary/hypothalamic dysfunction) through hormone testing, as suggested by the European Urology guidelines 3
Secondary hypogonadism patients can potentially achieve both fertility and normal testosterone levels with appropriate treatment, while primary hypogonadism patients can only receive testosterone therapy, according to the European Urology guidelines 3

Metabolic disorders (obesity, diabetes) are common causes of hypogonadotropic hypogonadism, as reported by the European Urology guidelines 3
Medications affecting the hypothalamic-pituitary-gonadal axis can also cause hypogonadotropic hypogonadism, as noted by the European Urology guidelines 3
Check serum prolactin levels in patients with low testosterone combined with low/normal LH levels to rule out hyperprolactinemia, as recommended by the American Urological Association 4

Gonadotropin therapy with hCG initially, followed by FSH addition after testosterone normalization, is the first-line treatment for fertility preservation/restoration, as recommended by the American Urological Association 1
Selective estrogen receptor modulators (SERMs) can block estrogen receptors at the hypothalamic level, stimulating GnRH secretion, and increase pituitary gonadotropin release and potentially stimulate spermatogenesis, as reported by the European Urology guidelines 5
Aromatase inhibitors can decrease estrogen production, inhibiting negative feedback on the hypothalamus, and improve hormonal and semen parameters, as noted by the European Urology guidelines 5

Evaluate sperm parameters if fertility is a concern, as recommended by the European Urology guidelines 5 and the American Urological Association 4
Lifestyle modifications (weight loss, exercise) can improve testosterone levels in men with obesity-associated secondary hypogonadism, as suggested by the European Urology guidelines 3

Avoid exogenous testosterone administration if fertility is desired, as it provides negative feedback to the hypothalamus and pituitary, inhibiting gonadotropin secretion, as noted by the American Urological Association 4