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12th April 2024
A 69 year old lady has presented to the GP with recurrent polyuria during the day and at night-time, her recent investigations are shown below.
A 69 year old lady has presented to the GP with recurrent polyuria during the day and at night-time, her recent investigations are shown below. She denies any change to her water intake and reports that despite maintaining her normal eating and drinking, she still feels dehydrated.
| BM (4 – 7 mmol/L) | 4.1 |
| Na (135 – 145 mmol/L) | 139 |
| K (3.6 – 5.2 mmol/L) | 5.0 |
| Serum urea level (1.8 – 7.1 mmol/L) | 2.3 |
| Serum creatinine (61.9 – 114.9 μmol/L) | 110 |
| Serum osmolality (275 – 295 mOsm/kg) | 323 |
| Urine osmolality (< 100 mOsm/kg) | 110 |
What is the most likely cause of her symptoms?
Select the SINGLE most appropriate option from the list below. Select ONE option only.
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