Information about a laboratory test
A high result can be associated with supplements, high exposure or altered metabolism; the result alone is not a diagnosis of toxicity.
The Selenium test measures selenium status related to selenoproteins and antioxidant systems.
Ordered when trace-mineral deficiency or excess is suspected, with malabsorption or in selected clinical contexts; timing and inflammation can affect some measurements.
A low result can be associated with inadequate intake, malabsorption or other clinical conditions; serum/plasma levels do not always perfectly reflect total-body stores.
A high result can be associated with supplements, high exposure or altered metabolism; the result alone is not a diagnosis of toxicity.
Start with the performing laboratory's reference interval, unit, specimen type and method. Numeric information on this page is stored as sourced example intervals or clinical thresholds.
>= 8 mcg/dL
Selenium concentration generally sufficient for selenoprotein synthesis
This is a sourced clinical-context threshold and should not be used alone as a diagnosis or treatment decision. The laboratory report and clinical context take priority.
Reference ranges may vary by laboratory, method used, age, sex, pregnancy status, and clinical context. The reference range on your own laboratory report takes precedence.
Trace-mineral results should be interpreted with sampling conditions, inflammation, diet and related proteins/elements.
Vitamin E (Tocopherol) Test — U.S. National Library of Medicine (MedlinePlus)
Government medical reference · 2025 · Vitamin E blood testing, deficiency/excess and age-specific interpretation · Verified: Aug 12, 2026
Selenium – Health Professional Fact Sheet — NIH Office of Dietary Supplements
U.S. government nutrition reference · 2025 · Serum/plasma selenium status and sufficiency context · Verified: Aug 12, 2026
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