Biochemical diagnosis in prolactinomas: some caveats

Area of Science:

• Endocrinology
• Clinical Chemistry

Background:

• Prolactinomas are the most common pituitary adenomas.
• Accurate diagnosis of hyperprolactinemia is crucial for patient management.
• Biochemical diagnosis can be challenging due to analytical issues and overlapping conditions.

Purpose of the Study:

• To review the diagnostic challenges in hyperprolactinemia.
• To discuss analytical difficulties and interfering factors in prolactin level measurement.
• To explore physiological and pathological causes of elevated prolactin.

Main Methods:

• Literature review of studies on hyperprolactinemia and prolactinomas.
• Analysis of potential causes for discrepant clinical and biochemical findings.
• Discussion of assay interferences, macroprolactinemia, and the hook effect.

Main Results:

• Analytical difficulties can lead to false positive or false negative prolactin levels.
• Macroprolactinemia and the high-dose hook effect are significant sources of error.
• Numerous physiological and pathological conditions can increase prolactin levels, mimicking prolactinomas.

Conclusions:

• Clinical suspicion is vital when symptoms and biochemical results are incongruent.
• Understanding analytical interferences and differential diagnoses is essential for correct hyperprolactinemia diagnosis.
• Proper interpretation of prolactin levels requires consideration of various interfering factors and conditions.