A 60 year old man presents to your clinic with increasing lethargy. He has a history of bronchial carcinoma. Given the results below, what is the most appropriate investigation for this patient?
| Sodium |
108mmol/L |
| Potassium |
3.6mmol/L |
| Urea |
3.2mmol/L |
| Creatinine |
67µmol/L |
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