Selenium Serum Selenium
A mineral in trace amounts that your thyroid needs to do its work.
Also printed asSe
What it measures
A trace mineral concentrated in the thyroid and in the body's antioxidant enzymes.
Needed to convert storage thyroid hormone into the active form, and to keep antioxidant defences working.
Why it matters for how long you stay well
The gap between too little and too much is narrower than for most nutrients, so this is a number to read carefully rather than a supplement to take casually.
How it shows up in daily life
You will rarely feel it directly. Its effects show up through the thyroid and through how well you recover.
High and low readings
When it reads high
From supplements; a large excess is toxic.
When it reads low
Soil selenium is low in parts of India, so intake follows where the food was grown.
What moves it
Daily life
- nuts, especially Brazil nuts
- fish, eggs and whole grains
- the soil where your food was grown
Common questions
What does Serum Selenium measure?
A trace mineral concentrated in the thyroid and in the body's antioxidant enzymes. Needed to convert storage thyroid hormone into the active form, and to keep antioxidant defences working.
What does a high Selenium result usually mean?
From supplements; a large excess is toxic.
What does a low Selenium result usually mean?
Soil selenium is low in parts of India, so intake follows where the food was grown.
What is the usual reference range for Selenium?
A broad adult reference band is 70–150 µg/L. Labs differ, so read your result against the band printed on your own report.
Educational only, not a diagnosis. A single number means little without your history and the rest of your panel, so discuss your own results with your physician.
Typical adult reference band
- Adults
- 70–150 µg/L
Labs differ. The band printed on your own report is the one that applies to your result.
Reported in µg/L
Ageing relevance
3/5
A moderate ageing association; used in clinical longevity panels.
Worth knowing
How much is in your food depends mostly on the soil it was grown in.
Have a report with this marker on it? Read it in context.
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