Counties Manukau lost almost 500 breathing apparatus, 30 humidifiers, 10 electric beds and 100 blood pressure monitors. Director of hospital services Jenni Coles said items were often borrowed by patients who failed to return them, and were not stolen.
She said thousands of taxpayer dollars were spent each year to replace the missing equipment.
"It is public funds and I can guarantee the patient care is not compromised by this, but it would be better if we didn't have to replace these items so the money can be spent on other items or frontline care," Coles said. She said people might not understand the items were needed, or were not able to return the equipment easily.
Several hospitals have run successful amnesty campaigns to recover dozens of wheelchairs, walking frames and crutches - many found in riverbeds and on roadsides.
While many hospitals were able to itemise missing equipment, Waitemata DHB chief executive Dale Bramley asked the Herald on Sunday to pay more than $1,500 for a worker to check their inventory.
"It is estimated that it will take one staff member two weeks extracting and compiling data to obtain a response," he said.
The Nelson Marlborough DHB said it did not hold information on missing medical supplies or devices.
Ngaire Buchanan of Auckland DHB said missing equipment could be annoying for staff and stressful for patients. "When you have a patient ready to go home and it is delayed because something can't be found, that can be nerve-racking."
Buchanan said in 2010 the DHB adopted an "end-to-end" tracking process for equipment. "So far for 2013, we have five pieces of equipment unaccounted for."
It has also streamlined returns. "We found people often didn't know where to bring stuff back to," she said. "Now they can more or less drop it at the front door."
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