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Complement C3mg/dL

Complement C3 is an immune system protein that gets used up during active immune reactions.

See your own Complement C3 on its range.

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What Complement C3 measures

Complement C3 is an immune system protein that gets used up during active immune reactions.

If your Complement C3 is low

C3 below the range is commonly associated with the immune system actively consuming complement, as in lupus or some kidney conditions, or with liver function.

Commonly associated with

Worth asking your clinician: How C4 and the autoimmune panel look.

If your Complement C3 is high

C3 above the range is commonly associated with inflammation or infection, since it rises as part of the acute-phase response.

Commonly associated with

Worth asking your clinician: Whether other inflammation markers are raised.

Typical reference range

GroupTypical range
Adults90 – 180 mg/dL

Typical adult values used by many US labs. Your own report prints the range your lab validated for its method, and that range is the one that counts. Labwise always uses the printed range first.

If it is within range

Your complement C3 is within the range printed by your lab.

Also listed as

C3, C3 Complement, Complement Component 3, C3, Serum

Related tests

This page is general information about what a laboratory test measures and what results outside a reference range are commonly associated with. It is not medical advice, does not diagnose any condition and does not replace your clinician. Discuss your results with your healthcare provider.