Case Report
Concurrent Central Diabetes Insipidus and Acute Myeloid Leukemia
| Laboratory testing at diagnosis | Assay | Result | Normal values |
| WBC | 2.3 K/μL | 3.8–10.5 K/μL | Hb | 13.5 g/dL | 13.6–17.2 g/dL | MCV | 101 fL | 80–97 fL | 24-hour urine collection | 12.5 L urine output | 0.8–2.0 L | Prolactin | 8.9 ng/mL | 3.5–19.4 ng/mL | Cortisol (AM) | 18.6 μg/dL | 10–20 μg/dL | Free T4 | 0.81 ng/L | 0.70–1.48 ng/L | Total testosterone | 338 ng/dL | 300–720 ng/dL |
| 8-hour water deprivation test | Assay | 0 hours | 8 hours | Normal values |
| Serum sodium | 144 mmol/L | 149 mmol/L | 136–145 mmol/L | Serum osmolality | 302 mOsm/kg | 308 mOsm/kg | 278–298 mOsm/kg | Urine osmolality | 123 mOsm/kg | 235 mOsm/kg | 50–1200 mOsm/kg |
| Desmopressin challenge | Time | Urine output (mL) | Urine osmolality (mOsm/kg) |
| 12-1 PM | 725 | 87 | 1 PM | 2 mcg DDAVP SubQ | 1-2 PM | 160 | 341 | 2-3 PM | 80 | 467 |
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