Selenium Blood Test
Mar 15, 2026
Selenium Blood Test
A selenium blood test measures this essential trace mineral that's crucial for thyroid function (required to convert T4 to active T3), immune response, antioxidant defence (as part of glutathione peroxidase), and male fertility—with UK and European soils being relatively low in selenium compared to North America, making subclinical deficiency more common than you might expect.
At Blood Test London, selenium testing costs from £265 with results in 2-3 days. A doctor always reviews every result.
Why Selenium Matters
Key Functions
Function | How Selenium Helps |
|---|---|
Thyroid function | Required to convert T4 → T3 |
Antioxidant defence | Part of glutathione peroxidase |
Immune function | Supports immune response |
Male fertility | Essential for sperm production |
Cancer protection | May reduce certain cancer risks |
Cardiovascular health | Antioxidant and anti-inflammatory |
Selenium Reference Ranges
Level (μmol/L) | Interpretation |
|---|---|
Below 0.8 | Deficient |
0.8-1.0 | Low |
1.0-1.4 | Optimal |
1.4-2.0 | Adequate |
Above 2.0 | High (risk of toxicity) |
Signs of Selenium Deficiency
Fatigue
Poor thyroid function
Weakened immunity (frequent infections)
Hair loss
Male infertility
Muscle weakness
Poor cognitive function
Who Should Test?
Thyroid disorders (especially Hashimoto's)
Male infertility
Frequent infections
UK/European residents (low soil selenium)
Vegetarians/vegans
Digestive disorders (malabsorption)
Heavy exercisers
Food Sources
Food | Selenium per serving |
|---|---|
Brazil nuts (2-3 nuts) | 140 μg (careful—easy to overdo) |
Tuna (100g) | 70 μg |
Eggs (2 large) | 30 μg |
Chicken (100g) | 25 μg |
Daily requirement: 55-75 μg
Book Your Selenium Test
Price: From £265
Results: 2-3 days
Doctor review: A doctor always reviews every result
Book via WhatsApp | Phone: 020 3951 3429
Blood Test London by The Wellness. Selenium testing from £265. A doctor always reviews every result.