CRP and chronic kidney disease: In the study by Balmforth et al., a thinner choroid was associated with a lower estimated glomerular filtration rate (eGFR) and, in the case of CKD, proteinuria, as well as increased levels of circulating C-reactive protein, interleukin 6, asymmetric dimethylarginine (ADMA), and endothelin−1 [41].