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

31 December 2022: Articles

Rare coexistence of disease or pathology

Nobumasa Ohara ^A* , Toshinori Takada ^D , Yasuhiro Seki ^D , Katsuhiko Akiyama ^D , Yuichiro Yoneoka ^B

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	(
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	(
The reference range for each parameter is in parentheses.