Prolactin · high result
What does a high Prolactin mean?
Short answer
Mildly high prolactin is very often medication-related (antipsychotics, metoclopramide, some antidepressants and blood-pressure drugs), stress, a recent meal, exercise, nipple stimulation, pregnancy or breastfeeding, or hypothyroidism. Levels above about 100–200 ng/mL, or a persistent elevation with irregular periods, milky discharge, low libido or headaches, point to a pituitary prolactinoma and are imaged with an MRI.
Medically reviewed by Youmna DiStefano, MD · Last reviewed September 2026
When does this result need same-day care?
- High prolactin with a severe headache or sudden vision loss — emergency care
What is the normal range for Prolactin?
- Male, age 18+: 4.00 – 15.2 ng/mL
- Female, age 18+: 4.80 – 23.3 ng/mL
Can reflect pituitary issues, certain medications, hypothyroidism, or stress. May affect fertility and cycles.
Full reference table, citations and testing options: Prolactin biomarker page.
What are the common causes of high Prolactin?
- Medications: antipsychotics (risperidone, haloperidol), metoclopramide, domperidone, verapamil, SSRIs, opioids, estrogens
- Pregnancy and breastfeeding
- Stress, exercise, sleep, meals, nipple stimulation, recent venipuncture stress
- Hypothyroidism
- Prolactinoma or other pituitary/hypothalamic lesions
- Kidney or liver failure, chest-wall injury
- Macroprolactin (a biologically inactive form that some assays count)
What symptoms go with high Prolactin?
- Irregular or absent periods, infertility
- Milky nipple discharge
- Low libido, erectile dysfunction
- Headaches or vision changes with larger tumors
What do clinicians usually check next?
- Repeat fasting, rested, 2–3 hours after waking, without breast stimulation
- TSH; pregnancy test
- Macroprolactin screen for a moderate elevation without symptoms
- Pituitary MRI for persistent unexplained elevation
Follow-up tests available at TestWell: TSH (Thyroid Stimulating Hormone) ($26.99), TSH + Free T4 ($27.99), Pregnancy Test (Quantitative hCG) ($26.99).
How do you recheck Prolactin?
Prices are cash-pay; every order adds one $6 lab processing fee. Physician authorization is included; no insurance or referral needed.
| Test or panel | Type | Price | Fasting | Results |
|---|---|---|---|---|
| Erectile Dysfunction Panel | Panel · 7 tests | $114.99 | Yes | 2–5 business days |
| Men's Hormone Panel | Panel · 7 tests | $199.99 | No | 3–5 business days |
| Women's Hormone Panel | Panel · 11 tests | $239.99 | No | 3–5 business days |
| Prolactin | Test | $39.99 | No | 2–4 business days |
Common questions
Can stress raise prolactin?
Yes — including the stress of the blood draw. Mild elevations are repeated under calm, fasting conditions before anything else.
Sources
Educational content, not a diagnosis. Lab results are one input; a clinician interprets them with your history and exam.