NHS Greater Glasgow and Clyde said a major IT problem - which led to hundreds of appointments and procedures cancelled over two days - has been repaired.
A total of 709 patients had appointments postponed on Tuesday and Wednesday.
The computer failure affected staff access to clinical and administrative systems.
The health board said its IT teams and external experts are continuing to run full diagnostic checks to try and understand exactly what caused the problem in the first place.
Robert Calderwood, NHSGGC chief executive, reiterated his apologies to the patients who had appointments postponed, and he praised the efforts of clinical staff and IT teams working to resolve the problem and in keeping the vast majority of our services running.
He added: “Although 709 patient episodes have had to be postponed our staff were able to see some 10,000 patients using manual back up systems.
“I can also report today that some of the patients affected have already been re-appointed and will be seen in the next few days.
“Arrangements are now being made to ensure that all the other patients affected will be offered a re-appointment as quickly as is possible.”
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