Selenium in Serum (Mass Concentration)

Why This Test Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms like fatigue, hair loss, or muscle weakness, or if you have conditions like thyroid disorders, autoimmune diseases, or chronic kidney disease. It may also be part of routine screening for selenium deficiency or monitoring in certain medical treatments.

What to Expect Before the Test

No special preparation is needed for this blood test. You may have a small needle inserted into your arm to draw blood, and you can eat and drink normally before the procedure. If you’re on blood thinners, let your provider know before the test.

What the Results Mean

Results are typically reported as a mass concentration of selenium in the serum. While reference ranges vary by lab, low levels may indicate deficiency, while very high levels could signal toxicity or certain medical conditions. Your provider will interpret results in the context of your overall health.

Common Conditions Linked to Selenium Levels

Low selenium levels may be associated with weakened immunity, thyroid dysfunction, or muscle weakness. High levels can sometimes point to selenium poisoning or underlying health issues like liver disease. This test alone doesn’t diagnose conditions but helps guide further evaluation.