Macroprolactinemia as a diagnostic pitfall in hyperprolactinemia: a systematic review and quantitative synthesis.
J Clin Endocrinol MetabSep 16, 2026
Clinical ResearchEndocrinology
Prashant Yadav, Amir H Hamrahian, Roberto Salvatori
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In 30 seconds
This systematic review analyzed 45 studies involving 2853 cases of macroprolactinemia among patients with hyperprolactinemia. The median total prolactin level attributed to macroprolactinemia was 61.4 ng/mL, while post-PEG monomeric prolactin was 11.7 ng/mL. The findings highlight the importance of distinguishing macroprolactinemia from true hyperprolactinemia to prevent unnecessary interventions.
Key findings
- Median total prolactin attributed to macroprolactinemia was 61.4 ng/mL (IQR 42.0-80.0).
- Median post-PEG monomeric prolactin was 11.7 ng/mL (IQR 8.3-13.2).
- Median maximum total prolactin was 264.5 ng/mL (IQR 97.0-425.5), often due to prolactinomas.
Why it matters
Understanding the characteristics of macroprolactinemia is crucial for clinicians to accurately interpret prolactin levels and avoid misdiagnosis. This can lead to more appropriate management of patients with hyperprolactinemia.