Table 3.
Urine analysis and electrolyte measurements of the five children (1–5).
| Characteristic | 1 | 2 | 3 | 4 | 5 |
|---|---|---|---|---|---|
| Age [years (sex)] | 3 (F) | 5 (M) | 7 (M) | 9 (M) | 12 (M) |
| Test date | Jan 2001 | Jan 2001 | Jan 2001 | Jan 2001 | Jan 2001 |
| Serum [HCO3–] (mmol) | 21.9 | 23.0 | 24.4 | 28.1 | 27.7 |
| TRP (%)a | 92 | 92 | 95 | 92 | 91 |
| PH | 6 | 7 | 6 | 7 | 6.5 |
| Specific gravity | 1.015 | 1.025 | 1.020 | 1.025 | 1.020 |
| Glucose dip | Negative | Negative | Negative | Negative | Negative |
| Protein dip | Negative | Negative | Negative | Negative | Negative |
a
TRP (%) = tubular reabsorption of phosphate = [1 – (Up×SCr)/(Sp ×UCr)] ×100, where Up, SCr, Sp, and UCr are urine phosphate, serum creatinine, serum phosphate, and urine creatinine concentrations, respectively. Normal values are > 85%.