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19 years
Does normal C3 C4 test means no autoimmune problem ?
Apr 7, 2015

Dr. Zakia Dimassi Pediatrics
C3 and C4 belong to the "complement system", only one of the components of the immune system, so by documenting normal levels of C3 and C4, we cannot rule out all types of autoimmune diseases. Additional tests, which are selected based upon the constellation of symptoms the patient has, and which organ systems are involved (the respiratory system, the digestive system, the skin, or a combination of those).
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