C3 is part of the complement system. The complement system is a group of nearly 60 proteins that works with your immune system and plays a role to protect the body from infections, and to remove dead cells and foreign material. This blood test is most often used to diagnose or monitor autoimmune disorders such as lupus and rheumatoid arthritis.
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Overview:
C3 is part of the complement system. The complement system is a group of nearly 60 proteins that works with your immune system and plays a role to protect the body from infections, and to remove dead cells and foreign material. This blood test is most often used to diagnose or monitor autoimmune disorders such as lupus and rheumatoid arthritis.