Table 2.

Biochemical and urinary parameters according to levels of renal functiona

Analyte (Reference Range)Group 1 eGFR >60b (n = 11)Group 2 eGFR 45 to 60b (n = 7)Group 3 eGFR 30 to 45b (n = 19)Group 4 eGFR <30b (n = 43)
Creatinine (mg/dl)0.9 ± 0.21.5 ± 0.31.9 ± 0.23.2 ± 1.4
eGFR (ml/min per 1.73 m2)86.0 ± 21.252.3 ± 5.336.4 ± 4.521.4 ± 5.7
Phosphate (2.5 to 4.6 mg/dl)3.2 ± 0.42.9 ± 0.63.4 ± 0.54.0 ± 0.8
Calcium (8.5 to 10.0 mg/dl)9.7 ± 0.59.4 ± 0.49.3 ± 0.49.3 ± 0.6
iPTH (10 to 60 pg/ml)48.5 ± 32.181.9 ± 32.2105.0 ± 48.9195.3 ± 174.5
FGF-23 (RU/ml)86.2 ± 61.4136.2 ± 69.1224.6 ± 200.1436.0 ± 493.8
FePO4 (%)12.1 ± 9.121.2 ± 6.825.0 ± 12.138.7 ± 13.9
25-(OH)D3 (>30 ng/ml)18.2 ± 6.320.1 ± 5.326.4 ± 12.423.8 ± 10.3
1,25-(OH)2D3 (>30 pg/ml)48.1 ± 33.534.4 ± 18.824.2 ± 13.618.0 ± 11.0
  • a eGFR, estimated GFR; iPTH, immunoreactive parathyroid hormone; FGF-23, fibroblast growth factor-23; FePO4, fractional excretion of phosphate. Variables are expressed as mean ± SD.

  • b Expressed as ml/min per 1.73 m2.