Up to 15 patients may have to have samples taken again after some were ruined in a Regina hospital laboratory.

The Regina Qu'Appelle Health Region said in a release the wrong chemical was poured into a machine at the Pasqua Hospital. 

The chemical affected 107 biopsy samples, but 54 of them were still in good enough shape for analysis. Doctors have decided that only 10-15 of the patients will need to take another sample, though doctors will talk to all of them about the error.

The health region said the error was noticed last week. A spokesperson said there have been changes to where the chemical is stored and how items are labelled. 

Samples were sent to the laboratory from a number of southern Saskatchewan communities.