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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.
Therefore, prolactin level should be drawn in a fasting state. Normal prolactin blood level is less than 20 ng/ml. A mild elevation such 20-40 ng/ml may be due to a peak of a pulse or due to stress or breast stimulation.