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Complement C4a details

What Complement C4a shows

C4a is a small fragment released when complement protein C4 is activated during an immune or inflammatory response, offering a more direct look at current complement system activation than a standard C4 level (which reflects available, unconsumed complement). It's a more specialized test used in certain complex inflammatory or autoimmune evaluations rather than routine screening. Elevated levels generally indicate active complement activation, consistent with an ongoing inflammatory or immune-complex-related process.

Tests that include Complement C4a

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