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Also reported in: g/L
Normal C3 means the complement protein system is not being noticeably consumed or deficient. This is reassuring against active immune complex disease or major complement pathway activation. Normal C3 combined with normal C4 makes autoimmune complement consumption unlikely.
Complement C3 is a central protein of the complement immune system. Very low C3 suggests the complement system is being noticeably consumed — most commonly by autoimmune diseases like lupus (SLE), cryoglobulinemia, or noticeable glomerulonephritis, where immune complexes activate and deplete complement proteins. noticeable congenital complement deficiency can also cause very low C3 with recurrent bacterial infections.
Urgent autoimmune and immunology evaluation is needed. Critical C3 depletion is associated with active lupus nephritis or other serious complement-activating diseases.
Complement C3: {{value}} {{unit}} — very low (ref: {{low}}–{{high}}; critical: <50)Low C3 indicates that the complement protein system is either being consumed by immune complexes or is being produced at a reduced rate due to liver disease (the primary site of C3 synthesis). The most common clinical interpretation is autoimmune disease consuming complement through immune complex deposition, particularly lupus nephritis, membranoproliferative glomerulonephritis, or cryoglobulinemia.
Medical evaluation is needed. ANA, anti-dsDNA, and full autoimmune panel should be checked alongside C4 to identify the cause and pattern of complement reduction.
Complement C3: {{value}} {{unit}} — low (ref: {{low}}–{{high}})Borderline low C3 may reflect early or mild complement consumption by immune complex activity, mild liver production impairment, or normal biological variation at the lower end of the reference range. When accompanied by low C4, an autoimmune complement-consumption pattern is more likely.
Monitor with repeat testing. Review symptoms for autoimmune features. Check C4 simultaneously to assess the complement consumption pattern.
Complement C3: {{value}} {{unit}} — borderline low (ref: {{low}}–{{high}})Normal C3 means the complement protein system is not being noticeably consumed or deficient. This is reassuring against active immune complex disease or major complement pathway activation. Normal C3 combined with normal C4 makes autoimmune complement consumption unlikely.
Normal result. No autoimmune complement consumption pattern detected.
Complement C3: {{value}} {{unit}} — normal (ref: {{low}}–{{high}})An optimal C3 level is consistent with adequate complement system protein availability without signs of depletion or consumption. The complement system plays critical roles in innate immune defense against bacteria and in clearing immune complexes. Optimal C3 reflects both healthy liver synthetic function and the absence of ongoing immune complex disease.
Excellent result. Normal complement system integrity.
Complement C3: {{value}} {{unit}} — optimal (ref: 100–170)C3 is an acute-phase reactant, meaning it rises mildly during inflammation or infection. A borderline elevated C3 can reflect low-grade chronic inflammation, metabolic syndrome, or post-infectious complement upregulation. Unlike low C3, elevated C3 is generally less clinically concerning though it may reflect an underlying inflammatory state.
Not typically notable. Review in context of other inflammatory markers. Address underlying inflammation if other markers also point to chronic inflammatory activation.
Complement C3: {{value}} {{unit}} — borderline elevated (ref: {{low}}–{{high}}; borderline: 180–220)Elevated C3 reflects acute-phase reactant activity — the liver upregulates C3 production during active inflammation, infection, or metabolic disease. Elevated C3 does not indicate complement deficiency but may reflect an active inflammatory process driving increased complement synthesis. Occasionally, high C3 is linked to increased thrombotic and cardiovascular risk.
Investigate with other inflammatory markers. If CRP and ESR are also elevated, identify the underlying inflammatory driver.
Complement C3: {{value}} {{unit}} — elevated (ref: {{low}}–{{high}}; elevated: >220)Very high C3 is a marked acute-phase response. At this level, the liver is producing unusually large quantities of this complement component in response to significant systemic inflammation. While elevated C3 itself is not the primary danger, the underlying inflammatory condition driving it requires investigation.
Seek medical evaluation for the underlying inflammatory trigger. Comprehensive inflammatory and infection workup is appropriate at this level.
Complement C3: {{value}} {{unit}} — very high (ref: {{low}}–{{high}}; very high: >300)Upload your lab report and get your actual values interpreted in plain English — instantly, with no medical training required.