You are the Emergency Department consultant acting as the emergency physician in charge when a general practitioner working in the out-of-hours clinic adjacent to the Emergency Department contacts you for advice about a 34-year-old man who has attended with persistent headaches.

Repeated clinic blood pressure measurements during the consultation are 186/112 mmHg. He has no previous history of hypertension. On further questioning, he reports recurrent episodes of palpitations, sweating, and headache over the past several months. He denies chest pain, breathlessness, visual loss, confusion, and reduced urine output. Physical examination is otherwise unremarkable, and there are no focal neurological deficits.

The general practitioner asks what the most appropriate clinical consideration should be in this scenario.

Which of the following best explains the appropriate clinical approach, according to NICE NG136: Hypertension in adults: diagnosis and management?