A widespread computer fault meant that nearly 6000 hospital patients' electronic discharge documents, which can include instructions for the next steps in medical care, were not sent to their GPs.
The problem was identified after GPs noticed that anticipated discharge summaries were not arriving from hospitals, said the Canterbury District Health Board, attributing the failure to an intermittent fault in three of Health Connect South's five computer servers.
"Calls were received from a few GPs on Friday 26 June who hadn't received discharge summaries for their patients who had been discharged from hospital," the DHB said.
Between May 18 and June 26, discharge summaries failed to be sent for 4638 patients who had attended hospitals in Canterbury; 218 on the West Coast; and 1071 in South Canterbury.
The discharge document summarises a patient's symptoms, treatment and medications and provides instructions on any required follow-up.