EMS Terminology Glossary

How to use this EMS terminology glossary

Every EMS agency speaks its own dialect. Rigs, runs, wall time, holdovers: new hires pick the language up on the job, and administrators who come from outside EMS often learn it the hard way.

This glossary groups the common terms by topic, from patient care to staffing and equipment, and defines each one in plain language.

Patient Care

These terms describe the care itself, from the level of provider to the paperwork behind a refusal.

• Advanced Life Support (ALS): Care that includes invasive skills such as IV medications, advanced airways and cardiac monitoring, usually provided by paramedics.
• Basic Life Support (BLS): Non-invasive care such as CPR, oxygen, bleeding control and splinting, usually provided by EMTs.
• Chief complaint: The main reason the patient or caller requested help, in their own words.
• Triage: Sorting patients by how urgently they need care, especially when there are more patients than resources.
• Vital signs: Pulse, blood pressure, breathing rate, oxygen saturation and temperature used to assess a patient.
• Scope of practice: The skills and medications a provider is legally allowed to use at their certification level.
• Protocol: Written treatment guidelines approved by the agency's medical director.
• Standing orders: Treatments a provider may give under protocol without contacting a physician first.
• Refusal: A documented decision by a competent patient to decline care or transport.
• Interfacility transfer: Moving a patient between healthcare facilities, such as hospital to hospital.

Operations & Dispatch

These cover how units move, wait and respond across a service area.

• Run / call: A single emergency response, from dispatch until the unit is back in service.
• Unit status: Whether an ambulance is available, en route, on scene, transporting, at hospital or out of service.
• Response time: Time from call receipt or dispatch until the unit arrives on scene.
• Mutual aid: An agreement for neighboring agencies to help each other when local resources are busy.
• System status management: Moving available units around a service area to keep coverage balanced.
• Post / staging: A location where a unit waits for its next call.
• Wall time: Time a crew spends at the hospital waiting to transfer care of a patient.
• Mass casualty incident: An event with more patients than available resources can normally handle.
• Medical direction: Physician oversight of an EMS system, online (by radio or phone) or offline (protocols and review).

Staffing & Scheduling

Schedulers use these words when they build a rotation, fill an open shift or settle a question about minimum staffing.

• Shift: A scheduled block of duty time, commonly 8, 12 or 24 hours in EMS.
• Rotation / shift pattern: The repeating cycle of on and off days, such as 24/48 or 48/96.
• Holdover: Requiring an employee to stay past the end of their shift to keep a unit staffed.
• Open shift: A scheduled slot that still needs someone to fill it.
• Shift trade: Two employees swapping shifts, usually with supervisor approval.
• Minimum staffing: The lowest number of qualified people required on duty at any time.
• Relief factor: Extra staff needed to cover time off, training and leave for each scheduled position.
• Partner / crew configuration: The certification levels paired on a unit, such as one paramedic and one EMT.

Certification & Training

Credentials and training carry their own vocabulary, and these terms come up in renewals, onboarding and quality review.

• Recertification: Renewing a certification by meeting continuing education and skills requirements before it expires.
• Continuing education: Ongoing training hours required to keep a certification current.
• Credentialing: An agency's local approval for a provider to practice within its system.
• Field training officer: An experienced provider who trains and evaluates new employees on the job.
• Skills verification: A hands-on check that a provider can correctly perform a required skill.
• Quality assurance / quality improvement: Reviewing calls and documentation to find and correct care or process issues.

Equipment & Vehicles

From the rig to the jump bag, these terms describe the vehicles, gear and supplies a crew relies on.

• Rig: Common slang for an ambulance.
• Truck check / rig check: An inspection of a vehicle and its equipment at the start of a shift.
• Jump bag: The portable bag of basic supplies carried to the patient.
• Cardiac monitor: A device that displays and records heart rhythms and can deliver a shock.
• Par level: The standard quantity of each supply item a unit or station should carry.
• Controlled substances: Medications such as narcotics that require strict tracking and secure storage.
• Out of service: A unit unavailable for calls because of maintenance, staffing or restocking.