CST3 and chronic kidney disease: KIDGO – Kidney Disease Improving Global Outcomes. eGFR - estimated glomerular filtration rate. SRM - standard reference material. CKD-EPI - chronic kidney disease epidemiology collaboration. eGFRcrea - glomerular filtration rate estimated from serum creatinine. MDRD - modification of diet in renal disease. eGFRcys - glomerular filtration rate estimated from serum cystatin C. CAPA - Caucasian, Asian, Paediatric, Adult.