Measures antibodies against ribonucleoprotein to help diagnose mixed connective tissue disease.

Evaluates IgA antibodies to tissue transglutaminase for diagnosing celiac disease.

Detects both IgG and IgM antibodies against phospholipids, used in diagnosing antiphospholipid syndrome.

Screens for antibodies against phospholipids, aiding in the diagnosis of clotting disorders related to autoimmunity.

Screens for antinuclear antibodies to help diagnose various autoimmune disorders.

Detects anti-double stranded DNA antibodies, highly specific for systemic lupus erythematosus.

Measures complement C3 levels, important for immune function and autoimmune disease activity.

Assesses complement C4 levels to evaluate immune system activation and autoimmune conditions.