Central Health says more than 100 patients who underwent tests to determine lung function or took part in sleep studies in the cardiopulmonary department of the James Paton Memorial Regional Health Centre are affected.
The authority says pulmonary function tests will be repeated for 98 patients after a malfunction was discovered in equipment used to calibrate diagnostic machines.
It says the problem was found during routine quality assurance checks and affects patients who underwent tests between Jan. 13 and Feb. 19.
Central Health says it has also discovered the reports of 34 patients who underwent studies to diagnose sleep disorders were not reviewed by an appropriate physician, while the status of 18 other reports is unknown.
In both cases, the authority says it is too early to determine whether the issues have had any impact on the health of patients.