Pituitary adenoma laboratory tests

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief: Ahmad Al Maradni, M.D. [2]

Overview

Laboratory findings consistent with the diagnosis of pituitary adenoma include elevated serum prolactin level and elevated or decreased serum levels of other pituitary hormones.

Laboratory Findings

• Laboratory studies are important in the diagnosis of pituitary adenoma, abnormal findings may include:

• Elevated or decreased serum level of adrenocorticotropic hormone (ACTH)
• Elevated or decreased serum level of growth hormone (GH)
• Elevated or decreased serum level of thyroid-stimulating hormone (TSH)
• Elevated or decreased serum level of follicle-stimulating hormone (FSH)
• Elevated or decreased serum level of luteinizing hormone (LH)
• Elevated serum level of prolactin

• Some adenomas secrete more than one hormone, the most common combination being growth hormon and prolactin.