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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.
General guidelines for diagnosing prolactin excess (hyperprolactinemia) define the upper threshold of normal prolactin at 25 Âµg/L for women and 20 Âµg/L for men. Similarly, guidelines for diagnosing prolactin deficiency (hypoprolactinemia) are defined as prolactin levels below 3 Âµg/L in women and 5 Âµg/L in men.