Three Hato Hone St John vehicles have been involved in separate crashes across the country in the last six weeks.
In August, a St John health shuttle was involved in a two-vehicle crash on State Highway 1 near Burnham, south of Christchurch.
"Six ambulances, four clinical managers, one rapid response vehicle and one helicopter responded to the scene and treated seven patients who have all been transported to hospital; two in critical conditions, three in serious conditions and two in moderate conditions," Hato Hone St John deputy chief executive - community health and engagement Sarah Manley said.
The St John Health Shuttle is a koha-based community service that transports people to health-related visits and then brings them home again.
A crash near Cambridge last week led to the death of a Hato Hone St John ambulance officer, Susan Cutler, and another motorist.