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Published on: January 17, 2018

Hyperprolactinemia.

Jaspreet Chahal1, Janet Schlechte

  • 1Department of Internal Medicine, University of Iowa, Iowa City, IA 52242, USA.

Pituitary
|April 12, 2008
PubMed
Summary
This summary is machine-generated.

Diagnosing hyperprolactinemia is straightforward, but identifying its cause is challenging. Macroprolactin screening is crucial for patients with atypical symptoms of elevated prolactin levels.

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Area of Science:

  • Endocrinology
  • Reproductive Medicine
  • Pituitary Disorders

Background:

  • Prolactin is a unique anterior pituitary hormone primarily regulated by hypothalamic inhibition.
  • Hyperprolactinemia diagnosis does not require stimulation or suppression tests.
  • Identifying the cause of hyperprolactinemia presents a diagnostic challenge.

Purpose of the Study:

  • To discuss the diagnostic challenges in hyperprolactinemia.
  • To highlight the significance of macroprolactin and its detection.
  • To differentiate causes of hyperprolactinemia based on prolactin levels.

Main Methods:

  • Review of diagnostic criteria for hyperprolactinemia.
  • Discussion of the "hook effect" in immunoradiometric assays.
  • Analysis of prolactin levels in relation to pituitary adenoma size and type.

Main Results:

  • Falsely low prolactin levels can occur in macroadenoma patients due to the hook effect.
  • Macroprolactin should be suspected in asymptomatic hyperprolactinemia cases.
  • Prolactin levels >250 microg/l suggest prolactin-secreting macroadenomas, while levels <94 microg/l suggest non-functioning adenomas.

Conclusions:

  • Hyperprolactinemia diagnosis is established by documenting elevated prolactin levels.
  • Screening for macroprolactin is essential in all hyperprolactinemic sera.
  • Distinguishing between prolactin-secreting and non-functioning pituitary adenomas is possible based on prolactin levels.