31 December 2022
: Case report 
A 75-Year-Old Woman with a 5-Year History of Controlled Type 2 Diabetes Mellitus Presenting with Polydipsia and Polyuria and a Diagnosis of Central Diabetes Insipidus
Rare coexistence of disease or pathology
Nobumasa Ohara1ABCDEF*, Toshinori Takada2D, Yasuhiro Seki3D, Katsuhiko Akiyama3D, Yuichiro Yoneoka
3BCD
DOI: 10.12659/AJCR.938482
Am J Case Rep 2022; 23:e938482
Table 1. Laboratory test results.
| Red blood cells | 431×10/μL | (386–492) |
| Hemoglobin | 12.7 g/dL | (11.6–14.8) |
| Hematocrit | 39.9% | (35.1–44.4) |
| White blood cells | 5,400/μL | (3,300–8,600) |
| Platelets | 29.5×10/μL | (15.8–34.8) |
| Urea nitrogen | 9.2 mg/dL | (8.0–20.0) |
| Uric acid | 4.2 mg/dL | (2.6–5.5) |
| Creatinine | 0.56 mg/dL | (0.46–0.79) |
| Sodium | 158 mEq/L | (135–147) |
| Potassium | 3.9 mEq/L | (3.5–4.8) |
| Chloride | 121 mEq/L | (98–108) |
| Triglycerides | 172 mg/dL | (50–149) |
| Total cholesterol | 230 mg/dL | (150–219) |
| Fasting plasma glucose | 114 mg/dL | (70–139) |
| Glycated hemoglobin | 6.6% | (4.6–6.2) |
| Immunoreactive insulin | 3.4 µU/mL | (2.2–12.4) |
| C-peptide immunoreactivity | 1.8 ng/mL | (0.8–2.5) |
| Plasma osmolality | 315 mOsm/kg | (275–290) |
| Arginine vasopressin | 0.6 pg/mL | (<2.8) |
| Thyroid-stimulating hormone | 3.79 μIU/mL | (0.50–5.00) |
| Free thyroxine | 1.11 ng/dL | (0.90–1.70) |
| Specific gravity | 1.002 | (1.005–1.030) |
| pH | 6.5 | (4.5–7.5) |
| Glucose | Negative | |
| Protein | Negative | |
| Occult blood | Negative | |
| Urinary osmolality | 67 mOsm/kg | (50–1,300) |
| Urinary sodium | 24 mEq/L | (88–285) |
| Urinary albumin | 8.0 mg/gCre | (<30.0) |
| The reference range for each parameter is in parentheses. | ||