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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.
There is no known normal function for prolactin in men. Prolactin is usually measured when checking for pituitary tumors and the cause of: 1  Breast milk production that is not related to childbirth (galactorrhea). 2  Decreased sex drive (libido) in men and women. 3  Impotence. 4  Infertility. 5  Irregular or no menstrual periods (amenorrhea).