Selenium Blood Test Kit
£75 ✓ In Stock
Your sample goes to a UKAS accredited laboratory meeting ISO 15189 standards.
After you receive your order confirmation email, please reply with your date of birth.
How it works
Your testing journey
From order to results in four simple steps. Full transparency on where each step happens and what it costs.
Receive your kit by post
Dispatched same working day if ordered before 3pm. Royal Mail Tracked delivery, typically 1–3 working days. 90% of kits arrive within 24 hours.
Visit a partner clinic
Book a phlebotomy appointment at one of our 365+ UK partner clinics. Take your kit with you — the phlebotomist will collect your sample using the materials provided.
Phlebotomy fee applies (paid at clinic)
Venous blood draw at a clinic
A trained phlebotomist takes a small blood sample from a vein in your arm using the vacutainers provided in your kit. The appointment takes around 10 minutes.
Return by prepaid envelope
Seal your sample in the biohazard bag provided and drop it in any Royal Mail postbox using the prepaid Tracked 24 envelope. Post Monday–Thursday for best results.
Venous Blood Collection Kit
This kit is sent to you and taken to your chosen clinic. The phlebotomist will collect your sample using the materials provided.
- 1Vacutainer blood collection tubes
- 2Needle and butterfly needle
- 3Tourniquet
- 4Alcohol swab
- 5Cotton wool and gauze
- 6Adhesive plaster
- 7Biohazard specimen bag
- 8Prepaid return envelope (Royal Mail Tracked 24)
- 9Laboratory request form
- 10Instructions for the phlebotomist
Selenium is an essential trace mineral that serves as a cofactor for numerous selenoproteins with critical biological functions. It is essential for thyroid hormone metabolism—the deiodinase enzymes that convert inactive T4 to active T3 are selenium-dependent, which is why selenium status directly affects thyroid function. Selenium also plays a key role in immune function, helping to regulate immune responses and reduce inflammation. As a component of glutathione peroxidase, selenium provides powerful antioxidant protection, neutralising harmful free radicals and protecting cells from oxidative damage. Adequate selenium status has been associated with reduced risk of certain cancers, cardiovascular disease, and cognitive decline. Deficiency can impair thyroid function (contributing to hypothyroid symptoms even with normal thyroid hormone levels), weaken immunity, cause muscle weakness, and increase susceptibility to infections. However, selenium has a narrow therapeutic window—excessive intake can cause selenosis, characterised by hair loss, brittle nails, garlic breath, nausea, and neurological symptoms. The UK Reference Nutrient Intake is 75 µg/day for men and 60 µg/day for women, but many Europeans consume less than this due to low soil selenium levels. Results outside the normal range may need a follow-up with your GP.
This test is for screening and information only — it is not a medical diagnosis or professional advice. Please have your results reviewed by a qualified doctor or healthcare provider who can explain what they mean for your personal health situation. If your results show anything outside the normal range, or if you're worried about your health, see your doctor as soon as you can. Don't change any medications or treatments based on these results alone — always talk to your healthcare provider first.
NO CLINICS, NO QUEUES, NO HASSLE
Four steps to clarity
01
Pick your panel
Browse over 200 clinically designed test kits and choose the one that fits your goals.
02
Kit to your door
Everything you need arrives in discreet packaging with step-by-step instructions inside.
03
Collect your sample
Follow the simple instructions in your kit — whether it's a finger-prick at home or a venous draw at a partner clinic.
04
Insights delivered
Clear, easy-to-understand results sent to you online with actionable health guidance.
Frequently asked questions
Selenium supports thyroid function, immune defence, and antioxidant protection. UK soil is relatively low in selenium, making dietary intake variable. Deficiency is a risk factor for Hashimoto's thyroiditis.
Mild deficiency may show no symptoms. More significant deficiency can contribute to thyroid dysfunction, weakened immunity, and fatigue.
No.
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