We analyzed serum sclerostin and DKK1 in 308 patients across the stages of chronic kidney disease (kDOQI stage 1–2 n = 41; CKD stage 3 n = 54; CKD stage 4–5 n = 54; hemodialysis n = 100; peritoneal dialysis n = 59) as well as in 49 healthy controls. This evidence concerns the gene DKK1 and chronic kidney disease.