FCEM2-0521

A 35 year old male presents to the emergency department complaining of palpitations. The triage nurse requests an urgent review as she is concerned about the patient’s blood pressure. The patient’s vital signs are as follows:

Blood pressure: 226/120 mmHg
Pulse: 122 bpm
Respiration rate: 18
Oxygen saturations: 97% on room air

You consider secondary causes of hypertension, such as phaeochromocytoma. Which of the following biochemical abnormalities is most commonly associated with phaeochromocytoma?