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immunology
Complement C4
C4· also: Complement C4
Clinical Overview
C4 is a complement protein involved in immune complex clearance. Low C4 with low C3 strongly suggests active lupus. C4 can also be low in hereditary angioedema.
Reference RangesWHO/IFCC standards
| Age Group | Reference Range | Unit | Notes |
|---|---|---|---|
| Adults (18–64) | 16 – 47 | mg/dL | — |
Also reported in: g/L.
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Related Topics
autoimmunelupusangioedema