Selenium, RBC

Possible Causes:

• Excessive selenium supplementation
• High dietary intake (Brazil nuts, selenium-rich seafood, organ meats)
• Environmental exposure (occupational exposure, contaminated water)

Possible Symptoms of Selenium Toxicity:

• Hair loss and brittle nails
• Gastrointestinal distress (nausea, diarrhea)
• Nerve damage (tingling, numbness)
• Garlic-like breath odor
• Liver or kidney dysfunction in severe cases

Reduce excessive selenium intake if high:

• Avoid overuse of selenium supplements
• Limit excessive Brazil nut consumption

Possible Causes:

• Selenium deficiency due to poor diet (low intake of Brazil nuts, seafood, or organ meats)
• Malabsorption conditions (e.g., celiac disease, Crohn’s disease)
• Heavy metal toxicity (selenium competes with mercury and lead for absorption)
• Increased oxidative stress or chronic illness

Possible Symptoms:

• Weak immune function (frequent infections)
• Fatigue and muscle weakness
• Cognitive decline or brain fog
• Thyroid dysfunction (hypothyroidism or Hashimoto’s disease)
• Increased risk of cardiovascular disease

Increase selenium intake if low:

• Brazil nuts (1–2 per day provides adequate selenium)
• Wild-caught fish (tuna, salmon, sardines)
• Grass-fed meats and organ meats
• Eggs and mushrooms

Selenium, RBC – What Does It Mean?

Selenium, RBC (Red Blood Cells) measures intracellular selenium levels, providing a better reflection of long-term selenium status compared to a standard serum selenium test. Selenium is a trace mineral essential for antioxidant defense, thyroid function, immune health, and detoxification.

Why Is This Test Important?

Selenium is crucial for:
- Antioxidant protection – A key component of glutathione peroxidase, which neutralizes harmful free radicals.
- Thyroid hormone production – Necessary for converting T4 (thyroxine) into T3 (triiodothyronine), the active thyroid hormone.
- Immune function – Supports immune cell activity and reduces inflammation.
- Heavy metal detoxification – Helps eliminate toxic metals like mercury.
- Cognitive and cardiovascular health – Supports brain function and prevents oxidative stress in the heart.

RBC selenium levels provide a longer-term view (about 3–4 months) of selenium status, unlike serum selenium, which can fluctuate with recent dietary intake.