31-year-old woman with nausea and increased thirst

Results of appropriate testing return and show the following:

Blood:

Test (units)	Result	Results (SI Units)
Glucose, random	112 mg/dL	6.2 mmol/L

Serum:

Test (units)	Result	Results (SI Units)
Calcium, total	13.6 mg/dL	3.4 mmol/L
Na+	136 mEq/L	136 mmol/L
K+	4.9 mEq/L	4.9 mmol/L
Cl-	95 mEq/L	95 mmol/L
HCO3-	22 mEq/L	22 mmol/L
Creatinine	0.8 mg/dL	74 micromol/L
TSH	0.45 mU/L	Normal 0.35-5.5 mU/L
FT4	1.2 ng/dL [14 pmol/L]	Normal 0.9-1.7 ng/dL [10.5-20 pmol/L]
Phosphate	1.9 mg/dL [0.6 mmol/L]	Normal 2.5-4.3 mg/dL [0.8-1.4 mmol/L]
Osmolality	285 mOsmol/kg	Normal 280-295 mOsmol/kg

Urine

Test (units)	Result	Results (SI Units)
Osmolality	210 mOsmol/kg	50-1200 mOsmol/kg