Which hormones are typically evaluated initially in suspected male hypogonadism?

Which hormones are typically evaluated initially in suspected male hypogonadism?

• A. FSH and LH
• B. Testosterone and SHBG
• C. Prolactin and TSH
• D. Estradiol and FSH

Answer: (C)

When evaluating suspected male hypogonadism, the first step is to look for reversible causes that can explain low testosterone. Prolactin and thyroid function are common culprits that can suppress the hypothalamic–pituitary–gonadal axis, so they’re often checked early. Hyperprolactinemia can blunt GnRH secretion, which lowers LH and FSH and subsequently testosterone. Thyroid disease, especially hypothyroidism, can contribute to reduced testosterone production and alter sex hormone–binding dynamics. If either test is abnormal, treating the underlying problem can restore testosterone without needing testosterone replacement. If prolactin and TSH are normal, the evaluation then proceeds to confirm hypogonadism with a morning testosterone level, and, if low, to measure LH and FSH to distinguish primary from secondary causes and guide further workup. The initial focus on prolactin and TSH helps quickly identify reversible contributors before moving on to more definitive hormonal testing.

When evaluating suspected male hypogonadism, the first step is to look for reversible causes that can explain low testosterone. Prolactin and thyroid function are common culprits that can suppress the hypothalamic–pituitary–gonadal axis, so they’re often checked early.

Hyperprolactinemia can blunt GnRH secretion, which lowers LH and FSH and subsequently testosterone. Thyroid disease, especially hypothyroidism, can contribute to reduced testosterone production and alter sex hormone–binding dynamics. If either test is abnormal, treating the underlying problem can restore testosterone without needing testosterone replacement.

If prolactin and TSH are normal, the evaluation then proceeds to confirm hypogonadism with a morning testosterone level, and, if low, to measure LH and FSH to distinguish primary from secondary causes and guide further workup. The initial focus on prolactin and TSH helps quickly identify reversible contributors before moving on to more definitive hormonal testing.