General guidelines for diagnosing prolactin excess (hyperprolactinemia) define the upper threshold of normal prolactin at 25 µg/L for women and 20 µg/L for men.
As directrices xerais para diagnosticar o exceso de prolactina (hiperprolactinemia) definen o limiar normal de prolactina en 25 µg/L para as mulleres, e 20 µg/L para os homes.