The prolactin test measures the level of prolactin, a hormone produced by the pituitary gland. Prolactin is primarily associated with lactation and plays a role in reproductive health in both males and females.

Prolactin levels rise during pregnancy and breastfeeding to stimulate milk production. Abnormal levels may affect menstrual cycles and fertility in females.

Elevated prolactin levels in males may cause symptoms like decreased libido, erectile dysfunction, and infertility.