Towards a best measure of emergency department crowding: Lessons from current Australasian practice.

ED crowding remains a common and important problem in Australasia. Crowding is multifaceted, so a single metric might not capture all important elements of crowding or be relevant to all stakeholders. However, a metric like Access Block, which encompasses elements of time, occupancy and workload and is relevant to stakeholders outside the ED, might hold the most promise.