Резюме 0.05). The mean value of the concentration of cystatin C in the blood serum (0.77 ± 0.01 mg/l) in patients with stage I chronic kidney disease corresponded to the calculated glomerular filtration rate on the basis of cystatin C: 100.2 ± 1.6 ml/min/1.73 m2 determined according to the equation of F.J. Hoek, 103.6 ± 1.9 ml/min/1.73 m2 — according to the equation of M. Zappitelli ....