Prolactin

In women to help investigate for galactorrhea (unexplained flow of breast milk), abnormal nipple discharge, amenorrhea (absence of menstrual periods), and/or infertility. In men, to diagnose the cause of decreased libido, erectile dysfunction, to detect and to monitor prolactin-producing pituitary tumor.

When there are symptoms like galactorrhea, visual disturbances, and headaches which suggest increased prolactin levels. To evaluate infertility, the low testosterone level in men and to detect recurrence of a prolactinoma.