Hi, as far as I can tell, most of the existing health facility systems use existing WiFi infrastructure and as such use "active" tags rather than passive ones. The only addition detectors/receivers needed then are if you want to have "pass through" senors/alarms at doorways and the like.
There are also bluetooth based systems available such as Tracker.

Dave

Thoughts and information provided on this forum are mine and mine alone and do not necessarily reflect the policy of NSW Health. They may also be complete bollocks!!