The error affected diagnostic imaging exams of 102 patients taken over four weeks, beginning April 30.
The tests were for some new procedures and combinations of general X-rays, ultrasounds, CT scans, mammograms and radio flouroscopies.
The tests were done in seven health regions in the province: Sunrise, Heartland, Five Hills, Prairie North, Cypress, Prince Albert Parkland and Mamawetan Churchill.
Officials say the glitch was discovered on June 1 and quickly corrected.
Administrators are following up with doctors to make sure they receive the test results, and patients are to be notified if they need follow up treatment.