Hello, My 19 years old son has elevated Prolactin level 27.7 (range 2.2-18.5). He also did the lab work for : Estradiol, Testosterone, LH, T4, T3, TSH, Glucose, Lipid Panel, Beta HCG, Comprehensive Metabolic Panel and everything was normal. Would you please advise what this elevated Prolactin level could be? What other tests he should do to get to the bottom of it? My son is vegan but he eats nutritious food, the last time he checked his B12 it was normal. Thank you very much!