CRP is a substance produced by the liver in response to inflammation.A high level of CRP in the blood is a marker of inflammation. It can be caused by a wide variety of conditions, from infection to cancer.

HBP is a granular protein derived from polynuclear neutrophils. The biosynthetic HBP in neutrophils is rapidly released under the stimulation of bacteria, resulting in increased vascular permeability and edema.

SAA proteins are a family of apolipoproteins associated with high-density lipoprotein in plasma. Different iso forms of SAA are expressed constitutively at different levels or in response to inflammatory stimuli . These proteins are produced predominantly by the liver.

PCT is a substance produced by many types of cells in the body, often in response to bacterial infections but also in response to tissue injury. 

IL-6 promptly and transiently produced in response to infections and tissue injuries, contributes to host defense through the stimulation of acute phase responses, hematopoiesis, and immune reactions.