Prolactin Blood Test
Feb 14, 2026
Prolactin Blood Test
A prolactin blood test measures the level of prolactin hormone, primarily responsible for milk production but also affecting reproductive function—elevated levels (hyperprolactinemia) can cause irregular periods, infertility, breast discharge, and low libido in both women and men. Common causes include stress, medications, and pituitary tumours (usually benign).
At Blood Test London, prolactin testing costs from £245 with results in 2-3 days.
Normal Prolactin Levels
Group | Normal Range |
|---|---|
Women (non-pregnant) | 80-600 mIU/L |
Pregnant women | Up to 10,000 mIU/L |
Men | 50-450 mIU/L |
Symptoms of High Prolactin
Women
Irregular or absent periods
Difficulty conceiving
Milky breast discharge (galactorrhoea)
Vaginal dryness
Low libido
Headaches/vision changes (if caused by pituitary tumour)
Men
Low libido
Erectile dysfunction
Breast enlargement
Rarely, breast discharge
Infertility
Causes of High Prolactin
Cause | Notes |
|---|---|
Prolactinoma | Benign pituitary tumour (most common pathological cause) |
Medications | Antipsychotics, antidepressants, anti-nausea drugs |
Hypothyroidism | Thyroid problems can raise prolactin |
Stress | Temporary elevation |
Pregnancy/breastfeeding | Normal physiological cause |
Chest wall stimulation | Repeated nipple stimulation |
Testing Tips
Test in the morning (lowest levels)
Avoid stress before test
Avoid nipple stimulation before test
Fast if possible
Inform about medications
If mildly elevated, often repeated to confirm (stress can cause temporary rise).
Book Your Prolactin Test
Price: From £245
Results: 2-3 days
Doctor review: A doctor always reviews every result
Requirements: Morning test, fasting preferred
Phone: 020 3951 3429
Blood Test London by The Wellness. Prolactin testing from £245, results in 2-3 days.