Complement C4a

Immune System

A healthy result should fall into the range 0 - 650 ng/mL.

The complement C4 test is one of the most frequently used complement component tests. Your doctor may order a complement C4 test if you’re experiencing symptoms that indicate an autoimmune disease. These symptoms may include:

  • extreme fatigue
  • muscle pain
  • joint pain
  • sudden, unexpected weight loss
  • muscle weakness
  • muscle paralysis

The complement C4 test is also sometimes used to monitor protein levels in people who have already been diagnosed with an autoimmune disease. Complement tests can provide doctors with valuable information about the effectiveness of current treatment for an autoimmune condition.

Complement C4a result calculator

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