A clinic blood pressure of 180/120 mmHg and higher with signs of retinal haemorrhage or papilloedema (accelerated hypertension) or life-threatening symptoms, such as new onset confusion, chest pain, signs of heart failure, or acute kidney injury.
Suspected phaeochromocytoma, for example labile or postural hypotension, headache, palpitations, pallor, abdominal pain, or diaphoresis.