Alberta's heath minister says changes have been made to make sure medical tests are accurate.

Fred Horne ordered an investigation after mistakes were discovered in pathology and diagnostic imaging tests in Calgary, Edmonton and Drumheller.

"What this looked at is at the system level what are the checks and balances that are in place and are they adequate in order to be able to assure Albertans that we are finding cases of error and that we are appropriately dealing with them, and even more important than that that are we equipped as best we can to prevent errors from occuring," he said.

The province says 325 patients were affected, but no one died and no one was seriously harmed.

"After the third incident I felt it was appropriate and neccessary from the point of view of just reassuring the public, and reassuring me as the person who's accountable for this, that we were doing everything we can to strengthen our system and processes," said Horne.

The province says Alberta Health Services and the College of Physicians and Surgeons of Alberta have already begun to implement the action plan recommended by the investigation.

However, the investigation says Alberta needs to make sure the processes are standardized across the province.

It also says the province needs to "strengthen communication between AHS and its zones, the CPSA, Alberta Health and affiliated health agencies that engage physicians" and develop a "single electronic system for managing all physician-related information."

Dr. Trevor Theman of the College of Physicians and Surgeons says they need to make sure specialists are up to date on technology.

"Of course the technology changes, and it changes quickly," he said.

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Province promises change after pathology, radiology review