Understanding Lab Tests for Prolactinoma
Written by Private MD Labs Medical Writing Team • Last Updated: September 8, 2025
Prolactinoma is a benign (non-cancerous) tumor of the pituitary gland that produces excessive amounts of prolactin, a hormone responsible for milk production. It is the most common type of pituitary tumor, and while imaging tests can visualize the tumor, blood testing for prolactin levels is the primary method for confirming the diagnosis.
Recommended Test
Prolactin
This blood test measures prolactin hormone levels and is the primary diagnostic tool for prolactinoma. Since these benign pituitary tumors produce excessive prolactin, elevated levels in the blood can directly confirm the diagnosis. The test is also essential for monitoring treatment response and determining the effectiveness of medications used to shrink the tumor.
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How Prolactinoma is Diagnosed
Symptoms of prolactinoma occur due to elevated prolactin levels in the blood or from the physical pressure the tumor places on surrounding brain tissues. Since prolactinomas directly produce prolactin, measuring this hormone in the blood is the most reliable way to confirm the diagnosis and monitor treatment effectiveness.
Understanding Your Results
Normal prolactin levels vary between men and women, with women typically having slightly higher baseline levels. Significantly elevated prolactin levels, especially when symptoms are present, strongly suggest the presence of a prolactinoma. Your healthcare provider will interpret results in the context of your symptoms and may recommend additional testing or imaging.
Important Considerations
The information here is for educational purposes only and is not a substitute for professional medical advice. Always consult with a healthcare provider for diagnosis and treatment.
