C - Reactive Protein (CRP) is a blood test that measures the level of CRP, a protein produced by the liver in response to inflammation.Its a nonspecific marker of inflammation, meaning it can be elevated in various conditions, including infections, autoimmune diseases, and heart disease. While CRP does not diagnose a specific condition, it can help monitor disease activity, assess the risk of heart attack or stroke, and guide treatment decisions.

An anti-streptolysin O (ASO) test measures the level of antibodies produced in response to a Streptococcus pyogenes infection. This type of bacteria causes strep throat and other infections. While not diagnostic for an active infection, a high ASO titer suggests a recent or past streptococcal infection. This test is often used to evaluate potential complications like rheumatic fever or glomerulonephritis that can occur after a strep infection.

THE RHEUMATOID FACTOR (RF) TEST DETECTS THE PRESENCE OF AN AUTOANTIBODY (AN ANTIBODY THAT ATTACKS THE BODYS OWN TISSUES) IN THE BLOOD. RF IS AN ANTIBODY AGAINST THE FC REGION OF IGG, ANOTHER TYPE OF ANTIBODY.