C4 and C3 complement blood test
The C4 and C3 complement blood tests measure the levels of complement proteins C4 and C3 in the blood. Complement proteins are an essential part of the immune system and play a role in the body's defense against infections and the clearance of immune complexes. The C4 and C3 complement blood tests are commonly used to assess the activity and levels of these complement proteins in various autoimmune and inflammatory conditions.
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