ABD is a phrase used largely by non-psychiatric emergency staff to describe a clinical presentation of highly agitated, disturbed and often aggressive behaviour and clinical signs of physiological compromise

Category one is a critically ill patient who needs life-saving intervention. Category two is reserved for patients whose current condition is likely to destabilise to a category one if treatment is not administered in a short amount of time.

Involving a collision amongst another motor vehicle, pedestrian, animal, or stationary object.

Any event that a prudent lay person would believe threatens his or her life or limb in such a manner that a need for immediate medical care is created to prevent death or serious impairment of health.