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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.
Prolactin-secreting tumors. Overproduction of prolactin from a pituitary tumor (prolactinoma) can cause a decrease in normal levels of sex hormones â estrogen in women and testosterone in men. Excessive prolactin in the blood affects men and women differently.