C-Reactive Protein or CRP is a protein produced by the liver. Your CRP will rise when there is inflammation throughout your body. a CRP test is given to
-Check for flare ups of certain inflammatory diseases such as lupus, vasculitis, or rheumatoid arthritis.
-Check your risk of heart disease.
-Check to see if an anti-inflammatory drug is working to treat a known condition.

There is usually no CRP found in your blood, but if you get a positve test, which means you have inflammation in you body, this may be due to this short list of conditions:

-Heart attack
-Connective tissue disease
-Inflammatory bowel disease
-Rheumatoid arthritis
-Rheumatic fever