Individual tests

This test measures antibodies against streptolysin O, a substance group A streptococcus bacteria produces. A marked rise or a persistently elevated antibody count indicates that a streptococcus infection or post-streptococcal sequelae are present.
C3 is part of the complement system, a group of nearly 60 proteins that work with your immune system, playing a role in protecting the body from infections and removing dead cells or foreign materials. This blood test is often used to diagnose or monitor autoimmune disorders like lupus and rheumatoid arthritis.
The complement system consists of almost 60 proteins that work together to promote immune and inflammatory responses, destroy and remove foreign pathogens like bacteria and viruses, as well as damaged “self” materials (e.g. cells and proteins). C3 and C4 are the most frequently measured complement proteins. These tests measure the amount or activity of complement C4 in the blood.
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