Rule et al developed a series of equations for estimating the glomerular filtration rate for a patient with chronic kidney disease (CKD). The authors are from the Mayo Clinic in Rochester, Minnesota.
Glomerular Filtration Rate (GFR) in mL per min per 1.73 sq m BSA
Description of GFR
Stage of Chronic Kidney Disease
>= 90
normal or increased
1 (I)
60 to 89
mild decrease
2 (II)
30 to 59
moderate decrease
3 (III)
15 to 29
severe decrease
4 (IV)
0 to 14
renal failure
5 (V)
Analytical Method for Cystatin C: immuno-nephelometry (Dade Behring )
Stage of CKD
Serum Cystatin C with Native Kidney
Serum Cystatin C After Renal Transplant
1
<= 0.80 mg/L
<= 0.87 mg/dL
2
0.81 to 1.09
0.88 to 1.23
3
1.10 to 1.86
1.24 to 2.24
4
1.87 to 3.17
2.25 to 4.10
5
>= 3.18 mg/L
>= 4.11 mg/L
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