Selenium, Serum

Selenium, Serum

What it is

The Selenium, Serum test measures the level of selenium, an essential trace mineral, in the blood. Selenium plays a critical role in antioxidant defense, thyroid hormone metabolism, immune function, and protection against cellular damage. Abnormal selenium levels may lead to nutritional deficiencies, toxicity, or contribute to various health conditions.

Uses

This test is used to:

• Assess selenium nutritional status.
• Identify selenium deficiency, which can impair immune and thyroid function.
• Detect selenium toxicity from excessive supplementation or environmental exposure.
• Monitor selenium therapy in patients with certain conditions.
• Support evaluation of metabolic or antioxidant-related disorders.

Symptoms / Conditions That May Lead to the Test

Doctors may recommend this test if you have:

• Signs of selenium deficiency (fatigue, muscle weakness, impaired immunity).
• Symptoms of selenium toxicity (hair loss, brittle nails, skin rashes, neurological problems).
• Thyroid dysfunction or unexplained hormonal imbalance.
• History of long-term parenteral nutrition or restricted diets.
• Occupational or environmental exposure to selenium compounds.

Abnormal Results

• Low Selenium Levels: May indicate nutritional deficiency, thyroid disorders, impaired immune response, or increased risk of cardiovascular disease.
• High Selenium Levels: Suggest toxicity, often due to excessive dietary supplementation or occupational exposure, leading to symptoms such as nausea, hair/nail changes, and neurological disturbances.

Results are interpreted with dietary history, clinical symptoms, and other laboratory findings.

Risks

The test requires a simple blood sample. Risks are minimal and may include:

• Mild pain or discomfort at the puncture site.
• Minor bruising or bleeding.
• Rare dizziness or fainting after blood collection.