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Hormones

Prolactin Test

A prolactin blood test measures the level of prolactin, a pituitary hormone primarily known for its role in lactation. Prolactin also influences reproductive function, immune regulation, and metabolic processes in both men and women.

Doctor's Assessment Included

Reference Ranges

See the value that applies to you:

Choose male or female — this range differs by sex.

Enter your age — this range changes with age.

This range also depends on context such as cycle phase or sample material; the highlighted rows apply to your group.

Male Your group
ug/l
Low 4 Normal 15.2 High
Female Your group
ug/l
Low 4.8 Normal 23.3 High

Reference ranges may vary between laboratories. When you order a test, a BIG-registered doctor assesses your personal results in context. For treatment decisions, discuss your results with your GP.

Check your own value

Prolactin: what this test measures

This test measures the concentration of prolactin in your blood. Prolactin is produced by the anterior pituitary gland and plays a role in breast milk production, reproductive function, and various metabolic and immune processes.

Prolactin: why this value matters

Monitoring prolactin is important because elevated levels may be associated with menstrual irregularities, infertility, or pituitary abnormalities. In men, high prolactin could suggest reduced testosterone production or pituitary concerns.

Prolactin: how to prepare

  1. Pause biotin

    Required

    Do you take a supplement with biotin (vitamin B8, common in hair, skin and nail supplements)? Stop it 72 hours before the draw. Biotin interferes with the measurement of these values.

  2. Preferably in the morning

    Recommended

    A morning draw makes this value easiest to compare with its reference range. Plan the draw before 10:00 if you can.

  3. Arrive early and sit quietly first

    Required

    This value rises with stress and exertion. Arrive 30 minutes early and sit quietly before your blood is drawn.

  • Water is always fine. Drink as usual beforehand, it makes the draw easier.
  • Take your usual medication, unless your own doctor told you otherwise.

Prolactin: when is testing worthwhile?

Testing may be recommended if you experience irregular menstrual periods, unexplained milk discharge, infertility, decreased libido, or headaches and visual changes. Testing is typically done in the morning for most accurate results.

Prolactin: symptoms of a high or low value

Low Levels

Low prolactin is uncommon and usually not associated with significant symptoms. In postpartum women, very low levels may be associated with difficulty breastfeeding. Consult your healthcare provider for interpretation.

High Levels

Elevated prolactin may be associated with irregular or absent periods, unexpected milk production, headaches, decreased libido, or erectile dysfunction in men. Very high levels could suggest a pituitary adenoma.

Prolactin: what to do about an abnormal value

Male

If Low

Low prolactin in men is generally not concerning.

If High

Elevated prolactin may indicate a pituitary adenoma or medication side effect. Consider MRI and consultation with an endocrinologist.

Female

If Low

Low prolactin in women is generally not concerning unless breastfeeding.

If High

Elevated prolactin may disrupt ovulation. Consider evaluation for pituitary adenoma and medication review.

Prolactin: lifestyle and this value

Stress management, adequate sleep, and avoiding medications known to raise prolactin may help maintain healthy levels. Regular exercise at moderate intensity is often beneficial. Consult your healthcare provider about any medications that may affect prolactin.

Prolactin: frequently asked questions

Can medications affect prolactin levels?

Yes, many medications including certain antipsychotics, antidepressants, and anti-nausea drugs can raise prolactin levels. Always inform your healthcare provider about your medications before testing.

Is prolactin testing only for women?

No, prolactin testing is important for both men and women. In men, elevated prolactin may affect testosterone levels, libido, and fertility.

What time of day should prolactin be tested?

Prolactin levels are typically highest in the early morning. Testing is usually recommended in the morning after fasting, while avoiding stress and strenuous exercise beforehand.

Test Products

This marker is included in the following test panels.

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Medical standards

Dr. Naimi oversees the medical standards behind our content and assessments.

Medical policy
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Prolactin

€27,-