Evaluation and Management of Galactorrhea

Initial Assessment and Laboratory Evaluation

The American College of Radiology recommends a thorough history and physical examination to assess for signs of hypothyroidism, hirsutism, and other androgen excess in patients with galactorrhea 1
Serum prolactin measurement is essential for all patients with galactorrhea, as recommended by the Endocrine Society, with a focus on evaluating for secondary causes including medication effects, thyroid dysfunction, and renal impairment 1, 2
Follicle-stimulating hormone (FSH) and luteinizing hormone (LH) should be considered if amenorrhea is present, as suggested by the American College of Obstetricians and Gynecologists 1
Assessment for macroprolactin should be considered if prolactin is elevated but clinical features are inconsistent, as recommended by the Endocrine Society 3

High-resolution pituitary MRI protocols are considered the gold standard for imaging the pituitary gland, as recommended by the American College of Radiology 4

For mildly elevated prolactin levels, serial measurements should be considered to exclude stress-related hyperprolactinemia, as suggested by the Endocrine Society 2, 3
Samples should be collected at 20-60 minute intervals using an indwelling cannula, as recommended by the Endocrine Society 2

Failing to check prolactin levels in patients with galactorrhea, even when there are no other symptoms, is a common pitfall, as noted by the American College of Physicians 1
Not performing dilutions when measuring prolactin in patients with large pituitary lesions can lead to falsely low results due to "hook effect", as warned by the Endocrine Society 3
Neglecting to assess for macroprolactin can cause laboratory hyperprolactinemia without clinical symptoms, as cautioned by the Endocrine Society 3