Several blood tests can help in the diagnosis and management of rheumatoid arthritis (RA). Here are some commonly used blood tests for RA:
Rheumatoid Factor test detects the presence of antibodies called rheumatoid factors in the blood. Rheumatoid factors are found in around 70-80% of individuals with RA, but they can also be present in other conditions.
Anti-Cyclic Citrullinated Peptide Antibodies test detects antibodies that target proteins with citrulline, which is a modified amino acid. The presence of anti-CCP antibodies is highly specific to RA and can help confirm the diagnosis.
Erythrocyte Sedimentation Rate test measures the rate at which red blood cells settle in a test tube over a specified time period. Elevated ESR levels can indicate the presence of inflammation in the body, which can be associated with RA.
C-Reactive Protein test measures the level of C-reactive protein, a marker of inflammation, in the blood. Elevated CRP levels can indicate inflammation in the body, including in individuals with RA.
Complete Blood Count provides information about various blood cell types, including red blood cells, white blood cells, and platelets. It helps evaluate for anemia, which is common in RA, and assesses overall blood cell counts.
Remember that the diagnosis of RA is not solely based on blood tests. Clinical evaluation, symptoms, physical examination, and imaging studies also play a crucial role. Additionally, not all individuals with RA will have positive results for these blood tests, and some tests may be used to monitor disease activity and response to treatment over time. A rheumatologist will interpret the results and consider the overall clinical picture when diagnosing and managing RA.