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The rheumatoid factor blood test helps diagnose Rheumatoid arthritis (RA). The common symptoms of RA include pain, swelling and stiff joints. By measuring rheumatoid factor in your blood, your doctor will be able to determine whether you have rheumatoid arthritis. The test also aids in distinguishing between different forms of arthritis and rheumatoid arthritis, in addition to other diseases. Antistreptolysin O (ASO) is an antibody targeted against streptolysin O, a toxic enzyme produced by group A Streptococcus bacteria. ASO and anti-DNase B are the most common of several antibodies that are produced by the body’s immune system in response to a strep infection with group A Streptococcus. This test measures the amount of ASO in the blood. Group A Streptococcus (Streptococcus pyogenes) is the bacterium responsible for causing strep throat and a variety of other infections, including skin infections (pyoderma, impetigo, cellulitis). The test measures the amount of CRP in your blood. CRP levels can reflect the presence and severity of inflammation in your body. CRP is a protein produced by the liver. When bacteria or other cellular invaders threaten the body, the liver releases CRP into the bloodstream to help organize the body’s defenses. This early response is called an acute phase response. It is also referred to as inflammation or an inflammatory response. The acute phase response also can occur in chronic conditions, including some autoimmune diseases.
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