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C4 (Complement 4 factor)

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C4 (Complement 4 factor)

Accredited Facility E-report Qualified Specialists

This test is done to measure C4, a key protein in the complement system involved in immune defense and inflammation. Abnormal levels may indicate immune system activation or consumption. Low levels are often associated with autoimmune diseases such as systemic lupus erythematosus, while high levels may reflect inflammation or infection.

  • If autoimmune diseases such as lupus are suspected or monitored.
  • If there are unexplained inflammatory or immune-related symptoms.
  • If complement system disorders are being evaluated.
  • If a healthcare provider is assessing disease activity or immune response.
  • No fasting is required.
  • No special preparation is usually needed.
  • Inform your healthcare provider about medications affecting the immune system.
  • Follow any instructions provided by the laboratory or healthcare provider.
    • C4 (Complement 4 factor)
    No labs currently offering this test.