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Normal prolactin levels for men range from 3 to15 nanograms per milliliter or 3 to15 micrograms per liter. For nonpregnant women, the range is 4 to 23 nanograms per milliliter or 4 to 23 micrograms per liter, according to WebMD.
Back to TopWhy the Test Is Performed. Prolactin is a hormone released by the pituitary gland that stimulates breast development and milk production in women. There is no known normal function for prolactin in men. Prolactin is usually measured when checking for pituitary tumors and the cause of: