Simple Cystatin C Formula for Estimation of Glomerular Filtration Rate in Overweight Patients with Diabetes Mellitus Type 2 and Chronic Kidney Disease

Table 3

The accuracy of formulas within 30% of estimated ⁵¹CrEDTA clearance values for different stages of CKD.

	Stages of chronic kidney disease
CKD stage (number of patients); GFR, mL/min/1.73 m^2	Stage 1 (10); ≥90	Stage 2 (17); 60–89	Stage 3 (36); 30–59	Stage 4 (39); 15–29	Stage 5 (11); <15
Equation	Accuracy within 30% of estimated ^51CrEDTA clearance (%)
C&G formula	90.0	70.6	55.6	43.6	27.3
MDRD formula	20.0	58.8	69.4	69.2	63.6
CKD-EPI formula	20.0	58.8	69.4	66.7	54.5
CKD-EPI creatinine and cystatin formula	30.0	52.9	63.9	71.8	72.7
Simple cystatin C formula	80.0	82.4	63.9	23.1	0.0