A fire in the intensive care unit at one of Perth’s major hospitals has left four people needing medical treatment, and forced the evacuation of the ICU.

The fire at Fiona Stanley Hospital, in Perth’s south, was reported just after 10am within a self-contained room in the ICU.

The hospital said the blaze did not spread beyond the room, but that there was some water damage and “smoke impact”.

Because of that, the hospital said “some services will remain temporarily closed while remedial works are undertaken.”

“Three staff members and a patient are undergoing clinical assessment,” a spokesperson for the South Metropolitan Health Service said.

Parked fire car seen outside Fiona Stanley Hospital.

Firefighters got the blaze under control within half an hour. (ABC News)

The ABC understands their condition is stable.

Disruption to hospital services

The hospital said “cautionary but necessary actions” were being taken, including patient relocation from the impacted ward, short term ambulance diversions, as well as disruption to some surgical and outpatient services. 

“The Emergency Department remains open and accepting patients presenting with medical emergencies,” the hospital said.

“For now, paediatric and adult emergency patients will share a facility.

“Non-urgent visitors are urged to postpone their visit to the hospital, while our staff work to return services to normal.”

Investigations into the cause of the fire underway.