Vitamin D challenge test (performed by administering 2000 IU of 25-hydroxyvitamin D3(25(OH)D3) for 10 days with alternate day measurement of calcium and vitamin D metabolites)
| Day | Calcium (RR 2.2–2.6 mmol/l) | 25(OH)D3 (RR 15–100 pmol/l) | 1,25(OH)2D3 (RR 20–120 pmol/l) |
|---|---|---|---|
| 1,25(OH)2D3, 1,25-dihydroxyvitamin D3; RR, reference range. | |||
| −2 | 2.13 | 62 | 160 |
| 0 | 2.66 | 41 | 239 |
| 2 | 2.89 | 66 | 208 |
| 4 | 2.97 | 80 | 187 |
| 6 | 2.68 | 75 | 212 |
| 8 | 3.08 | 85 | 205 |
| 10 | 3.15 | 97 | 231 |