NPPB and chronic kidney disease: Laboratory results: creatinine, glomerular filtration rate based on the chronic kidney disease epidemiology collaboration equation, hemoglobin, hematocrit, urea, N-terminal pro b-type natriuretic peptide (NT-Pro BNP), ferritin, sodium, potassium, iron (fix capacity, iron), saturation (from transferrin), natriuretic peptide (BNP), and iron