Hormones
Prolactin
LOINC 2141-0 · mcg/L
What it is
Prolactin is a pituitary hormone best known for enabling breast-milk production. It also influences reproductive hormones.
Why it matters
It is checked for issues such as irregular periods, fertility problems, low libido or unexpected milk production.
What high values can mean
A higher value can result from pregnancy, breastfeeding, stress, some medications, or a benign pituitary growth.
What low values can mean
A lower value is generally not a concern.
How to improve it
Prolactin can rise temporarily with stress or activity; persistent elevation is evaluated for a cause.
Food & lifestyle
No specific food changes prolactin; rest before the test can avoid stress-related rises.
Preparing for the test
Stress and recent activity can raise prolactin; resting quietly before the draw is sometimes advised — follow your lab.
When to talk to a doctor
Discuss a high prolactin with a doctor, especially with irregular periods or unexpected milk production.
Related markers
Sources
- MedlinePlus (NIH)
- Testing.com (AACC)
Content reviewed on June 26, 2026
Medical disclaimer
This content is for educational purposes only. It is not medical advice and does not diagnose, treat, or prevent any condition. Reference ranges vary between laboratories — always use the range printed on your report and discuss your results with a healthcare professional.
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