Complement C3 [Serum]

The Protein S (Functional Assay) test is used to assess the activity level of protein S in the body, identify protein S deficiency and the risk of blood clot formation, and assist in monitoring and adjusting treatment for thrombotic disorders

TTG IgG is done in individuals with IgA deficiency.
Evaluating patients suspected of having celiac disease, including patients with compatible clinical symptoms, patients with atypical symptoms, and individuals at increased risk (family history, previous diagnosis with associated disorder, positivity for HLA DQ2 and/or DQ8..
Screening test for dermatitis herpetiformis, in conjunction with an endomysial antibody test.
Monitoring response to gluten-free diet in patients with dermatitis herpetiformis and celiac disease

A Beta-2 Glycoprotein 1 (B2GP1) IgG test measures the amount of IgG antibodies in the blood that target B2GP1. The test is used to help diagnose antiphospholipid syndrome (APS).

An ENA-6 Profile test is a blood test that detects antibodies that attack the body’s nuclear antigens. It can help diagnose autoimmune diseases like lupus, Sjögren’s syndrome, and scleroderma.