
This study hypothesized that decreasing haemoglobin (HB) levels before prolactinoma diagnosis might signal hyperprolactinemia onset and estimate disease duration. Sixty‐one of seventy men (87%) with prolactinoma presented with hypogonadism, and forty men (57%) had HB levels ≤13.5 g/dl at diagnosis. The cohort of men with prolactinomas and hypogonadism found a marked decrease in HB levels that preceded prolactinoma diagnosis by a median of 6.1 years, with a mean delay of 4.1 years between HB decrease and hypogonadal symptoms appearance. These results suggest that HB decline before prolactinoma diagnosis may serve as a marker for hyperprolactinemia onset in a subset of hypogonadal men and allow a more accurate assessment of disease duration.
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