CPT® Code 86431

The CPT® Code 86431 refers to the quantitative measurement of rheumatoid factor, which is a specific blood test used to assess the levels of rheumatoid factor antibodies in the serum. Rheumatoid factor is an immunoglobulin that can be present in various forms, including IgM, IgG, and IgA. This test is particularly significant in the diagnosis and monitoring of autoimmune conditions, most notably rheumatoid arthritis. Elevated levels of rheumatoid factor can indicate the presence of rheumatoid arthritis, but they may also be associated with other conditions such as hepatitis C, Sjogren syndrome, and various chronic infections. The test is performed on a blood sample that is obtained through venipuncture, a procedure that involves puncturing a vein to collect blood. The serum from the blood sample is then analyzed using a semiquantitative enzyme-linked immunosorbent assay (ELISA), which allows for the precise quantification of rheumatoid factor levels in the serum. This quantitative assessment is crucial for healthcare providers to evaluate the severity of the disease and to guide treatment decisions.