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(KMOV) -- Investigators say a patient at a north St. Louis County hospital went for a joyride Thursday morning in a stolen ambulance.

Around 1:20 a.m. an Abbott ambulance EMT crew went to DePaul Health Center in Bridgeton to pick up a patient. 

While inside, another patient entered the backdoors of the ambulance. 

The front doors were locked. 

The patient fled DePaul and headed towards St Mary's Hospital, in Clayton. 

A hospital source there told News 4 she was once a patient there.

It is standard procedure to lock all doors on an ambulance. 

Abbott officials are dealing with the EMTs who did not lock the back doors. 

While driving, the patient began throwing objects out the window. 

There was a GPS device in a cell phone, inside the ambulance. 

That allowed dispatchers to guide law enforcement officers to her location. 

She eventually tossed the phone out the window, but not before cops caught up with her.