I think you'd probably need some guidance from the Auditor General on that aspect. Technically speaking, the Office of the Auditor General will only investigate things within its mandate, which are federal government departments and agencies.
In the area of health, they did do a collaborative audit. The area was e-health, where each province did theirs, and then the federal Office of the Auditor General did an audit of Canada Health Infoway.
From a federal perspective, you could request that the Auditor General audit Canadian institutes of health information that report on wait times on a broad area. You can write the letter. You can request it. They can always say no. That's their prerogative to—