Blood and bone fragments have been found on medical instruments at Perth's Fiona Stanley Hospital, says the state's peak doctors group as it claims sterilisation problems continue.

The hospital's non-clinical services provider, Serco, was stripped of control for sterilisation services for not properly sterilising equipment or returning it on time in late February.

Department of Health staff were sent in to bring Serco staff up to speed, and the company was fined about $60,000 for breach of contract requirements.

However, Australian Medical Association WA president Michael Gannon said operating kits were still being returned in an unsatisfactory condition.

"There's been reports of bits of bone on some orthopaedic equipment, there's been reports, that are really hard to believe, of blood still being seen on some instruments," he said.

"So this gives us great concerns.

"We've been told the problem's been fixed and this would suggest that it hasn't.

"This just adds to the morale problems in the hospital, it just leaches at the confidence of the public in this new hospital.

"I can't imagine how people must feel if they've got surgery booked at the hospital at some stage."

'We need to be satisfied, public needs to be satisfied': AMA

Health Minister Kim Hames told Parliament in February Serco must improve or face losing the contract.

Dr Hames and Fiona Stanley Hospital have been contacted for comment on the latest revelations.

Dr Gannon said it was incumbent on the Dr Hames to act straight away, even if it meant quickly spending more funds.

"This needs a direct intervention from the Minister and his department to make sure that things have been fixed," he said.

"We need to be satisfied. The public needs to be satisfied."

Premier Colin Barnett has previously described issues at the hospital as teething problems.

Dr Gannon disagreed, saying many were structural problems.

He pointed to blowouts on surgical waiting lists, ongoing IT problems, and an Emergency Department straining to keep up with much larger-than-expected demand, which had seen at least one consultant quit.

Last month, Jared Olsen, 41, who had irritable bowel syndrome and suspected Crohn's disease, died after falling into a coma.

His father Phillip Olsen has said he believed his son was prescribed the wrong medication at Fiona Stanley Hospital.

"They're more than teething problems because some of them are structural and can't be fixed by asserting that they will get better on their own," Dr Gannon said.

"It was a very ambitious project to open a hospital and say we don't need paper.

"And yet we've got problems with doctors seeing patients in clinics, seeing patients in emergency departments and not having access to medical histories and test results.

"That's not only inefficient, it's dangerous."

