Further Investigations
The results of the patient's blood tests are:
| Sodium | 141 mEq/L |
| Potassium | 3.1 mEq/L |
| Urea | 8.0 mg/dl |
| Creatinine | 50 µmol/L |
| TSH | 1.13 MIU/ml |
| Plasma aldosterone concentration | 28.0 ng/dL |
| Plasma renin activity | 0.70 ng/ml/hr |
| 24-hr urinary aldosterone excretion | 42.0 µg/24-hr |
| 24-hr urinary sodium excretion | 200 mEq/24-hr |