Find the right blood test for you.

Measures antibodies to Sm and Sm/RNP antigens. Anti-Sm is highly specific to lupus, while Sm/RNP antibodies appear in lupus and mixed connective tissue disease. View details →

Screens for antinuclear antibodies, which target the body's own cell nuclei. A positive result reflexes to a titer and pattern, and can help assess suspected autoimmune conditions. View details →

Measures IgG antibodies to cyclic citrullinated peptide. Can help assess rheumatoid arthritis, and is more specific to that condition than rheumatoid factor. View details →

Measures antibodies to double-stranded DNA. Highly specific to lupus, and levels often track how active the condition is. View details →

Detects antibodies that block intrinsic factor, the protein needed to absorb vitamin B12. Can help confirm pernicious anemia as the cause of a B12 deficiency. View details →

Measures antibodies to myeloperoxidase, one of the ANCA antibodies. Can help assess forms of vasculitis, in which blood vessels become inflamed. View details →

Measures rheumatoid factor, an antibody found in rheumatoid arthritis and some other conditions. Less specific than anti-CCP, so results are interpreted together. View details →

Measures antibodies to thyroglobulin, a protein the thyroid uses to make hormone. Found in autoimmune thyroid disease, and important when interpreting thyroglobulin results. View details →

Measures antibodies to thyroid peroxidase, an enzyme the thyroid needs to make hormone. The main marker of autoimmune thyroid disease. View details →

Measures antibodies that bind the TSH receptor on the thyroid. The key test for Graves' disease, the most common cause of an overactive thyroid. View details →