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Table 2 Evidence of renal phosphate wasting as determined by calculation of tubular maximum for phosphate corrected for glomerular filtration rate (TmP/GFR). The patient in case 3 had a 24-h urine phosphorus measurement of 900 mg/24 h, but urine creatinine measurement was not obtained, so TmP/GFR was not calculated

From: A rare cause of atraumatic fractures: case series of four patients with tumor-induced osteomalacia

 

Case 1

Case 2

Case 4

Serum phosphorus (2.7–4.6 mg/dL)

1.7

1.3

1.8

Serum creatinine (0.5–1.0 mg/dL)

0.77

0.85

0.90

Urine phosphorus (mg/dL)

24.1

 

35.1

Urine phosphorus (400–1200 mg/24 h)

653.1

990.0

446.8

Urine creatinine (mg/dL)

46.5

 

86.1

Urine creatinine (1.0–1.8 g/24 h)

1.3

1.7

1.1

Calculated TmP/GFR (2.5–4.2 mg/dL)

1.3

0.8

1.4