Understanding TNF-α: Normal vs Optimal Ranges
Also known as: tnf-alpha, tnf-α, tumor necrosis factor alpha, tnf alpha
?What is TNF-α?
Tumour necrosis factor-alpha (TNF-α) is a master pro-inflammatory cytokine produced primarily by macrophages and T cells. It coordinates systemic inflammation, promotes fever, activates immune cells, and induces apoptosis. TNF-α plays a central role in autoimmune diseases, chronic infections, and metabolic inflammation.
!Why It Matters
Chronically elevated TNF-α drives inflammation in rheumatoid arthritis, inflammatory bowel disease, psoriasis, and metabolic syndrome. Elevated TNF-α promotes insulin resistance and is linked to type 2 diabetes progression. TNF-α inhibitors (adalimumab, infliximab, etanercept) are among the most widely used biologics in medicine.
Reference Ranges
| Range Type | Min | Max | Unit | Note |
|---|---|---|---|---|
| Lab Normal | — | 8.1 | pg/mL | Standard lab reference range |
| Optimal | — | 8.1 | pg/mL | Evidence-based optimal range for health |
| Longevity Target | — | 8.1 | pg/mL | Per longevity medicine research (Attia et al.) |
Lab normal ranges may vary between laboratories. Optimal and longevity targets are based on research literature and should be interpreted with your physician.
Symptoms of Imbalance
- Fatigue, fever, joint pain in autoimmune conditions
- Cachexia and muscle wasting in cancer or chronic infection
How to Improve Your Levels
- 1Anti-inflammatory diet rich in omega-3 fatty acids, polyphenols
- 2Regular exercise reduces TNF-α levels
- 3Weight loss significantly reduces adipose-tissue-derived TNF-α
- 4Biologic TNF inhibitors under specialist care for autoimmune conditions
When to Test
In autoimmune disease evaluation, metabolic dysfunction, or monitoring biologic therapy response.
Related Biomarkers
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