Selenium status can be assessed by determining the selenium level in which specimen?

Selenium status can be assessed by determining the selenium level in which specimen?

• A. Urine
• B. Hair
• C. Whole blood
• D. Saliva

Answer: (C)

Assessing a trace element’s status relies on choosing a specimen that best reflects the body's stores and functional status. For selenium, measuring it in whole blood is most informative because it represents selenium incorporated into circulating cells and plasma, providing a reliable snapshot of overall body selenium stores. Urine mainly shows recent intake and renal handling, not total body status. Hair can indicate long-term exposure but is prone to external contamination and variability in growth, making it less dependable. Saliva has not established validity as a selenium biomarker. Therefore, whole blood offers the most representative assessment of selenium status among the options.

Assessing a trace element’s status relies on choosing a specimen that best reflects the body's stores and functional status. For selenium, measuring it in whole blood is most informative because it represents selenium incorporated into circulating cells and plasma, providing a reliable snapshot of overall body selenium stores. Urine mainly shows recent intake and renal handling, not total body status. Hair can indicate long-term exposure but is prone to external contamination and variability in growth, making it less dependable. Saliva has not established validity as a selenium biomarker. Therefore, whole blood offers the most representative assessment of selenium status among the options.