blood test what is crp
C-reactive protein (CRP) is an annular (ring-shaped), pentameric protein found in blood plasma, whose levels rise in response to inflammation.It is an acute-phase protein of hepatic origin that increases following interleukin-6 secretion by macrophages and T cells.-reactive protein (CRP) is an annular (ring-shaped), pentameric protein found in blood plasma, whose levels rise in response to inflammation.