Trudy says her jobs is tough but it also has its better days - and top of that list is the babies she has delivered as an ambulance officer.
"Oh yes, that's absolutely hands on. I've delivered six and those are the very good days."
While the screaming sirens and racing ambulances are the public perception of St John, 70 per cent of call outs are medical, 10 per cent transfers and just 20 per cent emergencies.
It is the "huge variety" in the call-outs that makes Trudy thrive in her work. She recently went over a "day in the life" for a talk to the Ulysses Motorcycle Club and on that particular day she had been to 10 jobs, all different.
But she does agree some parts of working for St John are eye opening.
"I do see horrendous things. I think the level of domestic violence has gone up since I started. In the last 10 years, there's been a huge rise."
She also thinks the job has got a lot busier, perhaps because people are going to the doctor less often because of cost and health issues turn into emergencies.
"Rather than early evaluation and treatment, people wait and it becomes critical."
Trudy notes personality is part of good practice for St John.
"Reassurance can be 80 per cent of the job. It's good to have a sense of humour with people, that puts them at ease."
Trudy loves her job and is keen to pass her passion on, as well as her skills, to those just starting out.
"And we have had lots of success stories."
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