CST3 and chronic kidney disease: The glomerular filtration rate, as estimated by the equation of the Chronic Kidney Disease Epidemiology Collaboration (GFR via CKD-EPI), creatinine, and cystatin C did not change relevantly during fasting (GFR: P = 0.584, creatinine: p = 0.060, and cystatin C: p = 0.073).