Diagnostic Tests

C3 / C4 Complement Ratio Blood


C3 / C4 Complement Ratio Blood

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What is this test?

Decreased concentrations of both C3 and C4 suggest activation of the classical pathway, whereas decreased concentration of just C3 suggests activation of the alternative pathway. Both complement factors may be used to monitor activity of patients with systemic lupus erythematosus (SLE) and immune complex-induced vasculitis.

Also known as C3 / C4 Complement ratio.

Test Preparation

No special preparation is needed for C3 / C4 Complement Ratio Blood. Inform your doctor if you are on any medications or have any underlying medical conditions or allergies before undergoing C3 / C4 Complement Ratio Blood. Your doctor depending on your condition will give specific instructions.

Understanding your test results

GenderAge groupsValue
UNISEXAll age groups88 - 252 mg/dl
UNISEXAll age groups12 - 75mg/dl
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