Prolactin Test

Prolactin is a pituitary hormone closely linked to fertility and menstrual health, and measuring it helps investigate a range of symptoms in both men and women.

About the Prolactin Test

This test measures prolactin, a hormone produced by the pituitary gland. Raised levels can disrupt menstrual cycles, affect fertility, cause milk production unrelated to breastfeeding, and in men contribute to reduced libido. Prolactin testing is valuable for investigating these concerns and is often part of a wider hormonal or fertility assessment.

Preparation and turnaround

A venous blood sample is taken, ideally in the morning and when you are rested, as stress and recent activity can temporarily raise prolactin. Fasting is not usually required. Results are typically available within one to two working days and are best interpreted by a doctor.

Frequently asked questions

What can raise prolactin levels?

Stress, recent exercise, certain medications and, less commonly, a pituitary condition can raise prolactin. Your doctor interprets the result in context.

When is prolactin testing useful?

It helps investigate irregular periods, fertility concerns, unexpected milk production and, in men, reduced libido.

Is any preparation needed?

A morning sample when rested is preferred, as stress and activity can temporarily raise prolactin. Fasting is not usually required.