Clinical chemistry (also known as chemical pathology, clinical biochemistry or medical biochemistry) is the area of clinical pathology that is generally concerned with the analysis of bodily fluids for diagnostic and therapeutic purposes. All biochemical tests come under chemical pathology. These are performed on any kind of body fluid, but mostly on serum or plasma. The serum is the yellow watery part of blood that is left after blood has been allowed to clot and all blood cells have been removed.