Is my Prolactin normal?
Free blood test checker · Standard + longevity-optimal ranges
What is a normal Prolactin level?
Prolactin is produced by the anterior pituitary gland and is best known for stimulating milk production. Normal range is 2-18 ng/mL in non-pregnant adults. Elevated prolactin (hyperprolactinemia) is one of the most common pituitary disorders and can suppress gonadal function. Levels above 30 ng/mL warrant investigation; above 200 ng/mL strongly suggests a prolactinoma.
| Range | Values |
|---|---|
| Standard Reference | 2–18 ng/mL |
| High Risk | > 30 ng/mL |
What causes abnormal Prolactin levels?
Elevated prolactin is caused by prolactinoma (benign pituitary tumor — the most common pituitary adenoma), medications (antipsychotics, SSRIs, metoclopramide, opioids), hypothyroidism (TRH stimulates prolactin), PCOS, chest wall irritation, renal failure, and physiological causes (stress, nipple stimulation, exercise, sleep). Macroprolactin (a biologically inactive form) can cause falsely elevated readings.
When should you see a doctor?
See your doctor if prolactin is above 30 ng/mL, especially with symptoms like galactorrhea (milk discharge), amenorrhea, infertility, low libido, erectile dysfunction, or visual field changes (suggests pituitary mass effect). Levels above 200 ng/mL are highly suggestive of prolactinoma and warrant MRI of the pituitary.
Prolactin and longevity
While prolactin is primarily relevant to reproductive health, chronic hyperprolactinemia has metabolic consequences. Prolactin suppresses the HPG axis, leading to hypogonadism with its associated risks: bone loss, increased visceral fat, insulin resistance, and cardiovascular risk. Prolactinomas are the most common functioning pituitary adenomas and are highly responsive to dopamine agonists (cabergoline, bromocriptine), making this one of the most treatable endocrine disorders.
Where to get a Prolactin test
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Related biomarkers
These biomarkers are often tested alongside Prolactin for a more complete picture.
Frequently asked questions
What is a normal prolactin level?
What medications cause high prolactin?
How does high prolactin affect fertility?
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Sources: Reference ranges based on AHA/ACC, ADA, and AACE clinical guidelines. Biological variation data from Ricos/Westgard database. Longevity-optimal ranges reflect targets used by preventive and functional medicine practitioners.
Last reviewed: April 2026. This tool provides general health information and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your healthcare provider about your specific results.