PROLACTIN HORMONE IS PRODUCED BY THE PITUITARY GLAND, THIS TEST CAN HELP DIAGNOSE PROLACTINOMA, A USUALLY BENIGN TUMOR OF THE PITUITARY GLAND, IRREGULAR MENSTRUAL PERIODS, THYROID OR ADRENAL GLAND DYSFUNCTION. A DOCTOR MAY ORDER THIS TEST SOMETIMES TO EVALUATE SEXUAL DYSFUNCTION OF UNKNOWN CAUSE IN WOMEN AND MEN, HIGHER LEVELS OF PROLACTIN MAY DISRUPT NORMAL ORGASM, ALSO HAVE BEEN ASSOCIATED WITH TUMORS INVOLVING THE LUNGS, KIDNEY, AND PITUITARY GLAND. THERE IS ONLY TWO MAJOR FUNCTIONS OF PROLACTIN, (INDUCE MILK PRODUCTION AND TO DEVELOP NERVE CELLS).