Claims that surgeons used an old saw found in a cupboard to amputate a patient's leg are being investigated.
Staff at Ayr Hospital allegedly could not find the equipment to remove a metal plate from a man's leg during an operation and sent a member of the surgical team to B&Q to buy a new saw.
But after discovering the DIY store was closed, it is claimed that an old saw found in a cupboard was disinfected and used instead.
NHS Ayrshire and Arran launched an investigation after concerns were raised with senior management.
Scottish Conservative health spokesman Jackson Carlaw said if the allegations were proved true, it was an "indescribable way to treat any patient".
“This is simply incredulous. An indescribable way to treat any patient," he said.
“Despite the UK’s advancement in modern medicine this episode has all the finesse of improvised surgery on Nelson’s flagship during Trafalgar.
“l would hope that NHS Ayrshire and Arran thoroughly investigate this incident as a matter of urgency.”
Ann Gow, interim nurse director at the health board, said:
NHS Ayrshire and Arran is currently conducting a significant adverse event review into a recent incident within University Hospital Ayr, where standard procedures were not followed.