Reviewed: 13. Juli 2026
C3 Complement C3
Unit: g/l
Quick Explanation
Complement factor C3 is part of a system that directly fights pathogens and supports inflammatory reactions. Low values can indicate increased consumption with autoimmune diseases like lupus, elevated values occur with acute inflammation.
📊 Reference Values
ℹ️ Reference ranges may vary slightly between laboratories. Always compare your value with the reference range from your own lab report.
🔍 Possible Causes
Value too high — possible causes
- ·Acute inflammation or infection
Value too low — possible causes
- ·Autoimmune diseases (e.g. systemic lupus erythematosus)
- ·Congenital complement deficiency
- ·Chronic liver disease
This list shows possible causes — not a diagnosis. Only your doctor can correctly interpret your result.
🩺 Questions for Your Doctor
- →Does my low C3 value indicate an autoimmune disease?
- →Should C4 and ANA also be measured?
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Medical Disclaimer
The content on this page is for general information only and does not replace professional medical advice, diagnosis, or treatment. Always consult your doctor or pharmacist for health-related questions. Lab values should always be assessed in the context of your personal medical history.