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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.
In women, a prolactin test may be ordered if she displays symptoms of prolactinoma, which is a benign (non-cancerous)tumor on the pituitary glandthat produces high levels of prolactin. Symptoms of prolactinoma can include:1  unexplained headaches. 2  visual impairment.n other words, prolactin triggers lactation. The specific function of prolactin in men is not well known, although levels of prolactin have been found to be a measure of sexual satisfaction in both men and women. A prolactin test is a blood test that measures the level of the hormone in your body.