As part of your investigations, you order some blood tests.
You correctly matched the following 5 options
Sodium = low due to a lack of aldosterone.
Potassium = high due to a lack of aldosterone.
Haemoglobin = low, anaemia is a common finding.
Blood urea = high.
Serum cortisol = low due to adrenal insufficiency. This should be a morning sample as this is when levels should peak. If the result is greater than 400nmol/l adrenal insufficiency is unlikely to be the cause of the symptoms.