Lab test

Selenium Blood Test - Deficiency Testing

The selenium blood test measures the amount of selenium in the blood.

Typical price

From $179

Results

1-3 business days

Preparation

See preparation notes below

Sample

Blood draw or sample collection at a local center

The selenium blood test measures the amount of selenium in the blood. Selenium is a trace element and antioxidant that supports normal immune and thyroid function. The test can be used to monitor occupational or environmental exposure to selenium and to help identify a selenium deficiency when a clinician suspects it. Because both too little and too much selenium can be harmful, results are interpreted against a reference range and alongside symptoms and diet. The test is typically ordered for people with known exposure or with signs that may relate to selenium status.

• Blood selenium level Measures the concentration of selenium in a blood sample.

• Workers in industries that handle selenium or its compounds.
• People with diets or conditions that may lead to low selenium intake or absorption.
• Individuals being monitored for environmental or occupational selenium exposure.
• Those whose healthcare provider suspects an imbalance in selenium status.

• Fasting may be requested depending on the laboratory; follow the instructions you are given.
• Avoid selenium-containing supplements before testing unless a healthcare provider says otherwise.
• Report your diet, supplements, and occupation to the clinician.
• Wear a short-sleeved or loose top for the blood draw.

A result below the reference range may suggest low selenium status, which a healthcare provider can evaluate alongside diet, absorption, and symptoms. A result above the range may suggest excessive intake or exposure and prompt a review of sources. Selenium is essential but can be harmful in excess, so both low and high values matter. Because reference ranges and individual needs vary, discuss results with a healthcare provider rather than adjusting intake on your own.

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