Worried about low selenium levels? Selenium is an essential mineral that supports thyroid function, immune health, and antioxidant protection. This test measures serum selenium to assess whether your levels are within a healthy range, particularly if you have dietary deficiencies, thyroid issues, or concerns about oxidative stress.




Selenium Blood Test
- Results estimated in 7 working days
- Convenient testing options
- Bespoke doctor’s report
- Free delivery
Includes serum selenium, a vital mineral that plays a role in thyroid function, immune defence, and antioxidant activity.
How do you want to take your sample?
Please choose one option below-
Book a venous draw at a clinic Venous+£35Visit one of our national clinic partners for a nurse to take your venous blood sample from a vein in your arm. We’ll email you instructions on how to book after we’ve processed your order.
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Book a venous draw at home with a nurse Venous+£59Book a home nurse appointment for a nurse to take your venous blood sample from a vein in your arm.
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Self-arrange a professional sample collection VenousFreeMake an appointment at a phlebotomy clinic to have your venous blood sample taken. You will be responsible for arranging your appointment and any additional fees.
18+ Only. T&Cs apply.
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Go beyond the numbers
Get ready to elevate your health understanding with a personalised doctor's report. Go beyond results and tap into expert insights tailored just for you.
- Actionable advice
- Expert support
- Tailored recommendations

How it works
You have the flexibility to choose what works best for you. Enjoy the comfort of having a friendly nurse visit your home for a quick blood draw, opt for a convenient visit to one of our nationwide partner clinics, or self-arrange a draw at a location that suits you.
Take control of your health with Medichecks – order your blood test today!

Track, improve, and monitor your health over time.
MyMedichecks is your personal online dashboard where you can view your results, access clear and simple explanations about individual health markers, monitor changes in your health, and securely store information about your medical history, lifestyle and vital statistics.
Supported by a team of specialist and qualified doctors
Dr Natasha Fernando
Medical DirectorDr Tina Ghela
Digital Clinician LeadDr Susanna Hayter
Digital Clinician
What's in the test?
Minerals
Selenium - serum
Learn more
How to prepare for your test
Test limitations
Reviews
FAQs
Which foods are rich in selenium?
Selenium is found in many foods but has the highest quantities in Brazil nuts, seafood, kidney, and meat.
What are the symptoms of a selenium deficiency?
Selenium deficiency symptoms include weakness, dizziness, hair loss, and nausea. Although selenium is needed in your body, exposure to high levels can cause adverse health effects. Toxicity may occur following over-ingestion of supplements/foods or through occupational exposure.
What is selenium?
Selenium is an essential trace element with important functions throughout the body, including aiding the synthesis and metabolism of thyroid hormones, strengthening the immune system, and in DNA synthesis.