The Waitematā District Health Board is investigating how an elderly woman was able to leave a rest home without anyone noticing.
Maree Wilkins, 84, has been missing for a week.
Leigh Road Cottage rest home in Whangateau, just south of Leigh, reported her missing at 8.20am on 8 November, though she was last seen at 5.30pm the previous day.
A spokesperson for the DHB said the rest home immediately notified the police.
The rest home declined to comment.
A search and rescue operation for Mrs Wilkins was scaled back yesterday, but a police helicopter is continuing to search the coastline.