Lab test
Selenium Blood Test – Deficiency Testing
This page explains the selenium blood test – deficiency testing, what it measures, and how to order it. This test measures the amount of selenium in your blood. Selenium is a mineral that is important for many bodily functions.
What this test is
The selenium blood test is a laboratory analysis that quantifies the level of this essential trace mineral in your bloodstream. Selenium plays a vital role in antioxidant defense and thyroid hormone metabolism.
What it measures
- Selenium — reflects selenium intake and status
What the test involves
A healthcare professional will collect a blood sample, typically from a vein in your arm. The sample is then sent to a laboratory for analysis.
Why it is often ordered
Clinicians may order this test to assess for potential selenium deficiency or to monitor for excessive exposure, particularly in certain occupational settings. It helps evaluate if selenium levels are within a typical range.
Preparation
Before your test, follow any specific preparation instructions provided by the laboratory. This may include fasting or avoiding certain foods or supplements.
How results are reported
Your test results will indicate the measured level of selenium in your blood. Laboratories provide reference ranges, which are ranges of expected values, but these can vary between different labs.
Before you go
- Specific preparation instructions
- How to interpret your results
- When to expect your results
FAQ
Frequently asked questions
What is selenium?
Selenium is an essential trace mineral that the body needs to function properly. It acts as an antioxidant, protecting cells from damage, and is involved in thyroid hormone metabolism and immune function.
What are the symptoms of selenium deficiency?
Symptoms of selenium deficiency can be varied and may include muscle weakness, fatigue, cognitive impairment, and a weakened immune system. However, severe deficiency is uncommon in many regions.
Can I get too much selenium?
Yes, it is possible to have too much selenium, a condition known as selenosis. Symptoms can include hair loss, nail brittleness, nausea, and neurological problems. This is usually due to excessive supplementation.
How is selenium obtained?
Selenium is obtained through diet. Good sources include Brazil nuts, seafood (like tuna and sardines), organ meats, muscle meats, cereals, dairy products, and eggs.
Related
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Locations
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