To diagnose hyperprolactinemia, a blood prolactin level test is performed first. When high prolactin levels are detected, medical treatment is generally the first preferred method. Prolactin hormone is mostly secreted from a benign mass called an adenoma, which develops in the pituitary gland. These adenomas can be small in size (microadenoma) or large enough to be discernible by imaging (macroadenoma). If the prolactin level is above a certain threshold, the presence and size of a lesion should be evaluated with an MRI (magnetic resonance imaging) of the pituitary gland. High prolactin levels can be effectively balanced with orally administered medications. Typically, with two to three months of regular drug treatment, prolactin hormone levels can be brought down to the normal range.