A 70-year-old female presented to the emergency department at Frankston Hospital with confusion, nausea, and vomiting. S

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A 70-year-old female presented to the emergency department at
Frankston Hospital with confusion, nausea, and vomiting. She has no
history of diabetes mellitus. She is on regular medication to
control her hypertension. Her biochemistry test results showed:
SERUM
Analyte
Result
Reference interval
Sodium
115 mmol/L
135 – 145
Potassium
3.6 mmol/L
3.5 – 5.0
Chloride
82 mmol/L
95 – 108
Urea
3.6 mmol/L
2.7 – 8.0
Creatinine
59 μmol/L
45 – 90
Osmolality
238 mOsm/kg
275 – 300
URINE
Analyte
Result
Reference interval
Sodium
50 mmol/L
Not applicable