Interpret Your Prolactin Results
Enter your PRL value below and get an instant, free AI interpretation — a plain-English explanation checked against WHO/IFCC reference ranges.
Medical Disclaimer
This AI-generated interpretation is for educational purposes only and does not constitute medical advice, diagnosis, or treatment. Results may vary based on individual health factors not captured here.
Always consult a qualified healthcare professional before making any health decisions. Read full disclaimer →
Prolactin Normal Ranges
Prolactin is produced by the anterior pituitary and is the primary hormone responsible for milk production (lactation).
| Age Group | Sex | Reference Range | Unit | Notes |
|---|---|---|---|---|
| Adults (18–64) | Female | 2 – 29 | ng/mL | Non-pregnant |
| Adults (18–64) | Male | 2 – 18 | ng/mL | — |
| All ages | Female | 10 – 300 | ng/mL | Pregnancy |
Also reported in: µg/L, mIU/L.
Why Doctors Order the Prolactin Test
Hyperprolactinemia is one of the most common endocrine disorders causing secondary hypogonadism and infertility. The most important cause to exclude is a prolactinoma — a benign pituitary tumor that responds dramatically to dopamine agonist therapy (cabergoline, bromocriptine).
How to Enter Your PRL Result
Prolactin can be reported in ng/mL, µg/L or mIU/L. Choose the unit printed next to your result on the lab report so it is compared with the matching reference range.
Reference ranges for PRL differ between men and women, so entering your sex gives a more accurate reading.
What a Low or High PRL Can Be Associated With
Below the reference range
- Pituitary failure (hypopituitarism)
- Medications: dopamine agonists (cabergoline)
Above the reference range
- Prolactinoma (pituitary adenoma — most common pathological cause)
- Medications: antipsychotics (risperidone, haloperidol), metoclopramide, domperidone, SSRIs, opioids
- Hypothyroidism (TRH stimulates prolactin)
- Pregnancy and breastfeeding (physiological)
- Physical stress: chest wall surgery, nipple stimulation
These are common associations, not a diagnosis. A single result is read alongside your symptoms, history and other tests — discuss it with your doctor.
What Can Change Your PRL Result
Before you read too much into a result, consider whether any of these applied:
- Stress and venipuncture (raises prolactin transiently)
- Sleep (prolactin peaks during sleep)
- Recent eating (postprandial rise)
- Medications (extensive list of drugs raise prolactin)
Preparing for the test: Prolactin is best drawn 2–3 hours after waking (avoid early morning stress) in a fasting state. Breast stimulation and sexual activity should be avoided before testing.
Symptoms That Often Prompt PRL Testing
- Galactorrhea (milk discharge outside pregnancy in women and men)
- Irregular or absent periods (amenorrhea)
- Infertility
- Reduced libido and erectile dysfunction (in men)
- Headaches (from pituitary enlargement)
Want the full clinical guide to Prolactin?
Reference ranges, causes, symptoms, preparation, and FAQs.