These are the "stop what you're doing and get a clinician involved" moments. You are not expected to triage — you are expected to recognise a red flag and pull the cord quickly.
If a caller describes a symptom that sounds immediately dangerous, don't book them a routine slot:
Chest pain, shortness of breath → ED now
FAST-positive stroke signs → ED now, call 000 if it's happening while they're on the line
Severe headache with neck stiffness, sudden vision loss → ED now
Signs of sepsis (fever + confusion + shaking) → ED now
"It sounds like something that shouldn't wait for an imaging appointment. Please call your GP today or go to the emergency department — they can organise urgent imaging from there."
You are not the triage nurse, but knowing the rough distinction helps you direct the caller to the right place without delay:
ED now — chest pain, stroke signs, anaphylaxis, heavy bleeding, collapse, suspected sepsis. Minutes matter.
GP today — concerning but not immediately dangerous symptoms that need a clinician's judgement before imaging (e.g. persistent abdominal pain without red flags, new neurological symptoms that aren't acute).
We can see them — routine imaging on a valid referral, with no red-flag symptoms present today.
If you're unsure which bucket a caller falls into, default upward — send them to their GP or ED rather than booking a slot two weeks out.