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Selenium in Tissue (Mass Concentration)

Published: August 9, 2026Updated: August 16, 2026

This test measures the amount of selenium present in your body tissues, an essential mineral that plays a role in antioxidant protection and thyroid function.

Quick summary

["Selenium helps protect cells from oxidative damage and supports thyroid health."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
5725-7
Short code
Selenium Tiss-mCnt
Synonyms
Selenium Tiss-mCnt
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why Might This Test Be Ordered?

Your healthcare provider may recommend this test if you have symptoms like fatigue, muscle weakness, or thyroid issues, or if you have conditions like selenium deficiency or toxicity. It could also be part of a broader evaluation for metabolic or immune-related disorders.

What Does This Test Involve?

A small blood sample is typically drawn from your arm to analyze selenium levels in your tissues. The sample is processed and tested for selenium concentration using specialized laboratory techniques.

What Are Common Reasons for Testing?

Testing for selenium in tissues may be done to assess deficiency (low levels) or excess (high levels), especially if dietary intake or other lab tests suggest abnormalities. It can also help monitor conditions like selenium poisoning or certain genetic disorders.

What Do Results Mean?

Results are interpreted by your healthcare provider based on your overall health, symptoms, and other test results. Low selenium levels may indicate deficiency, while very high levels could signal toxicity or other underlying issues.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Selenium Level (Tissue)

Frequently asked questions

What are the typical reference ranges for this test?
Reference ranges for selenium in tissues vary by lab and individual health status. Your provider will compare your results to your specific reference range and clinical context.
How often should I get this test?
Frequency depends on your health status, symptoms, and medical needs. Your healthcare provider will determine how often to repeat this test based on your situation.
Can diet affect selenium levels?
Yes, dietary intake of selenium can influence tissue levels. Foods like nuts, whole grains, and seafood are good sources. Your provider may discuss dietary adjustments if selenium levels are low or high.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy