A complement C4 (also known as a complement component 4, or simply C4) is a test to measure the level of C4 proteins you have in your blood. These proteins play a role in how your immune system ...

...in patients with SLE ... E-C4d levels, but not serum C4 levels, were associated with disease activity... Recent evidence suggests that measurement of the erythrocyte-bound complement activation ...

The complement system is part of the body's immune system to fight pathogens and remove cell debris; its role in two autoimmune diseases and a mental disorder is a surprise Variants in a gene of the ...

Please provide your email address to receive an email when new articles are posted on . Erythrocyte-bound C4d, a biomarker for systemic lupus erythematosus patented by Exagen Diagnostics, is useful in ...

Levels of C4d and C4d/C4 associate with clinical and histopathological treatment response in proliferative lupus nephritis. Complement activation markers, particularly C4d and the C4d/C4 ratio, are ...

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A new study published in the journal Nature has homed in on the sex-specific activity of a certain gene that both increases the risk of developing schizophrenia and decreases the risk of developing ...

Exagen, a life science company serving the rheumatology specialty, and the Lupus Foundation of America, the national force devoted to solving the mystery of lupus, announced a new initiative to ...

This test is used to detect antinuclear antibodies in your blood. ANA antibodies attack healthy cells, mistaking them for foreign invaders. If you have a positive ANA test, it may mean you have an ...