Delays for anyone calling triple zero in Perth for an ambulance were alleviated on Tuesday after warnings of a service delay due to “extremely high demand”.

St John Ambulance issued a public alert for the first time ever, warning people of the situation, with a quarter of its fleet ramped as of Monday afternoon.

“Everything is back to normal, we appreciate there was a high demand last night,” St John WA chief operating officer Antony Smithson told Gareth Parker on 6PR Breakfast today.

“The system can handle 30-35 calls an hour, when it hits 40, that’s when we know those ramping issues can hit.”

The delays were compounded by the current number of active COVID cases in WA, Mr Smithson said.

Daily response data from St John Ambulance Calls show priority one call targets on Sunday, the most serious incidents where the service has a target of responding to 90 per cent of calls within 15 minutes, were only reaching 69.6 per cent within its target timeframe.

WA Health Minister Amber-Jade Sanderson said the government was working with public hospitals and had asked them to do everything they could to assist the ambulance service.

Press PLAY below to hear more on what the system can deal with