This blood test measures Prolactin levels. Prolactin is a large polypeptide synthesized in the pituitary gland but regulated by the hypothalamus.

Prolactin is similar in structure to human growth hormone. Production of prolactin is increased in the presence of estrogen and is responsible for the production of milk in females. In men, elevated levels of prolactin are associated with impotence and lower levels of testosterone.

Test Preparation For Optimal Results:

If possible, have the lab collected early in the morning or shortly after waking. For comparison purposes, have subsequent labs collected close to the same time.

Disclaimer: Your health care provider should evaluate a deviation from normal ranges.