A 54 year old male presents with a history of
increased thirst, polyuria and feeling generally unwell.
He gives a history of having had an
adrenalectomy 3 years prior to presentation as he had a phaeochromocytoma.
Clinical examination is unremarkable
Investigations reveal serum calcium 2.94 mmol/L
In this patient which one of the following
investigation is most likely to reveal the cause of the hypercalcaemia?
24 hour urinary catecholamines