CRP and IgA glomerulonephritis: In a previous study, the PAR was correlated with one of the most commonly used inflammatory serum markers, such as C-reactive protein (CRP); however, CRP and interleukin-6 (IL-6) are not routine examination items for patients with IgA nephropathy, and there is no guideline recommending routine examinations of CRP and IL-6 in IgAN patients.