Elevated levels of prolactin are easy to detect with a simple blood test but finding the cause of the excess hormone can be a bit more difficult.
Dopamine-suppressing drugs may cause prolactin levels to rise, since dopamine plays a role in managing prolactin levels. Patient who take certain prescription medications (including some anti-psychotic, anti-nausea, or blood pressure medications) may experience the symptoms of elevated prolactin levels due to the decrease in prolactin-suppressing dopamine.
Non-prolactinoma pituitary tumors may also cause elevated levels of prolactin. The interplay between hormones is extremely complex, and a disturbance in any one hormone level can upset the balance of the others.
Thyroid and adrenal conditions may affect prolactin levels — individuals with hypothyroidism (underactive thyroid), adrenal insufficiency may experience increased levels of prolactin.
Macroprolactin – a nonfunctioning prolactin molecule that is being counted by the lab assay but has no biological activity and doesn’t require treatment.
Breast pathology or stimulation need to be excluded.
Still, the most common cause of elevated prolactin is a prolactinoma. If blood tests reveal elevated levels of prolactin, the patient should be referred for imaging tests to look for a tumor.
Magnetic resonance imaging (MRI) produce detailed images of the brain and allow doctors to detect the presence of a tumor. The test is noninvasive, but requires time in a scanner to produce tiny slices of images that are then combined into three-dimensional pictures. Sometimes the patient will need a special contrast agent in advance to increase the visibility of any abnormality found.
Prolactinoma may be treated medically with prolactin-suppressing drugs; it can also be treated with radiation in the rare instances a tumor is locally aggressive.
A prolactinoma may be removed surgically if medication cannot control the prolactin production or tumor size and the patient cannot tolerate the medication. (See Surgery for a Pituitary Tumor.) Pituitary tumors are complex lesions that should be treated at major medical centers, by a team experienced in the diagnosis and treatment of tumors affecting the hormones.
Weill Cornell Brain and Spine Center is fortunate to be home to an internationally recognized surgical team with advanced skills in minimally invasive procedures to remove pituitary tumors. Neurosurgeon Theodore Schwartz, MD, and otolaryngological (ENT) surgeon Vijay Anand, MD, routinely use endonasal (through the nose) approaches to removing pituitary tumors, with no head or facial scarring. (See video of endonasal surgery technique.) The team has operated successfully on tumors that other surgeons have deemed impossible to remove. (See video of patient who had a giant tumor removed endonasally.) Dr. Dobri is well versed in all available medications for prolactinoma and has taken care of many patients with complex disease that requires combination medical therapy.
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Our Care Team
- Vice Chair for Clinical Research
- David and Ursel Barnes Professor in Minimally Invasive Surgery
- Professor of Neurosurgery, Neurology, and Otolaryngology
- Director, Center for Epilepsy and Pituitary Surgery
- Co-Director, Surgical Neuro-oncology
- Assistant Professor of Neurological Surgery
- Leon Levy Research Fellow
- Feil Family Brain and Mind Research Institute
- Assistant Professor of Neuroendocrinology in Neurological Surgery, Weill Cornell Medicine
- Director, Neurosurgical Radiosurgery
- Professor of Clinical Neurological Surgery
- Robert G. Schwager, MD ’67 Education Scholar, Cornell University
- Chief of Neurological Surgery, NewYork-Presbyterian Queens
- Co-director, Weill Cornell Medicine CSF Leak Program
- Chief of Neurological Surgery, NewYork-Presbyterian Brooklyn Methodist
- Alvina and Willis Murphy Associate Professor, Neurological Surgery
- Director, Brain Metastases Program
- Co-director, William Rhodes and Louise Tilzer-Rhodes Center for Glioblastoma
Reviewed by: Georgiana Dobri, M.D.
Last reviewed/last updated: December 2020