C-reactive protein (CRP) test is a blood test that measures the level of CRP, a protein produced by the liver in response to inflammation. Elevated CRP levels indicate the presence of inflammation in the body, which can be due to various conditions, such as infections, chronic diseases, or acute inflammatory processes. Book test test at affordable rates. Lab visits and FREE home sample collection available. Provide accurate and timely diagnosis in less than 6 hrs* to your customers.