Table 1.
Laboratory values.
| Lab test (reference value) | At presentation | After 6 months of phosphorus supplementation |
|---|---|---|
| Phosphorus (2.3–4.7 mg/dL) | 1.7 | 2.5 |
| Calcium (8.5–10.5 mg/dL) | 9.6 | 8.9 |
| Creatinine (0.57–1.11 mg/dL) | 0.82 | 0.83 |
| Total vitamin D (25–80 ng/mL) | 85 | 56 |
| 1,25-Dihydroxy vitamin D (19.9–79.3 pg/mL) | 154 | 126 |
| FGF23 (≤180) | <50 | — |
| Bone-specific alkaline phosphate (premenopausal female: 4.5–16.9 μg/L) | 12.1 | 12.7 |
| Parathyroid hormone (16–77 pg/mL) | 9 | 16 |
| Urine phosphorus (400–1,300 mg/24 hr) | 777∗ | — |
| Urine calcium (100–300 mg/24 hr) | 155 | — |
∗In patients with hypophosphatemia, urinary phosphate excretion above 100 mg/day or a fractional excretion, FEPO4, above 5 percent is indicative of renal phosphate wasting.