Emergency Medical Dispatch
MEDICAL AID CALLS
The Medical Priority Dispatch System (MPDS) is a medically-approved, unified system used to
dispatch appropriate aid to medical emergencies including systematized caller interrogation and
pre-arrival instructions. MPDS starts with the dispatcher asking the caller key questions. These
questions allow the dispatchers to categorize the call by chief complaint and set a determinant
level ranging from A (minor) to E (immediately life threatening) relating to the severity of the
patient’s condition.
Each call is assigned a sub-catego