PHTLS Scene Assessment and Safety — Questions and Answers

Question 1: During a multi-vehicle collision at night, which action best protects EMS providers while maintaining patient access?

Park directly behind the lead vehicle with lights off
Position the ambulance at an angle upstream with warning lights activated (Correct answer)
Stage the ambulance at least one mile from the scene
Approach on foot first, leaving the ambulance running on the highway

Correct answer: Position the ambulance at an angle upstream with warning lights activated

Positioning the ambulance at an angle upstream (fend-off position) with lights on protects providers from traffic while maintaining scene access.

Question 2: A provider arrives at a shooting scene where the suspect is reportedly still in the area. What is the correct action?

Enter with a partner to provide care rapidly
Stage at a safe location and await law enforcement clearance (Correct answer)
Approach the patient quickly and drag them to safety
Call medical direction for guidance before any action

Correct answer: Stage at a safe location and await law enforcement clearance

EMS must stage at a safe distance until law enforcement secures the scene before entering any active threat environment.

Question 3: Which of the following best describes 'scene size-up' in PHTLS?

Estimating the number of patients and calling for backup only
A continuous process of evaluating hazards, MOI, patient count, and resources throughout the response (Correct answer)
A one-time assessment performed on arrival before touching the patient
Reviewing the dispatch information while en route to the scene

Correct answer: A continuous process of evaluating hazards, MOI, patient count, and resources throughout the response

Scene size-up is a dynamic, ongoing process that begins with dispatch and continues throughout the entire response.

Question 4: At a confined-space rescue with a trapped worker, which hazard takes highest priority before entry?

Determining the patient's chief complaint
Verifying atmospheric oxygen levels and toxic gas concentrations (Correct answer)
Estimating extrication time
Checking the patient's insurance information

Correct answer: Verifying atmospheric oxygen levels and toxic gas concentrations

Atmospheric testing for oxygen deficiency and toxic gases is mandatory before entering any confined space to prevent rescuer incapacitation.

Question 5: A provider is caring for a patient when bystanders become increasingly agitated and aggressive. What is the most appropriate response?

Continue patient care and ignore the bystanders
Ask bystanders to assist with lifting the stretcher
Reassess scene safety and prepare to relocate care if needed (Correct answer)
Call for law enforcement only after violence occurs

Correct answer: Reassess scene safety and prepare to relocate care if needed

Scene safety must be continuously reassessed; a deteriorating bystander situation may require relocating patient care operations.

Question 6: When approaching the scene of a structure fire with reported victims, which is the EMS provider's primary concern?

Locating the incident commander and operating within the ICS (Correct answer)
Determining the mechanism of injury for documentation
Beginning triage immediately upon arrival
Staging near the structure for rapid patient extraction

Correct answer: Locating the incident commander and operating within the ICS

EMS providers must integrate into the Incident Command System and receive assignments from the incident commander at structure fire scenes.

Question 7: Which personal protective equipment is minimally required for all trauma patients?

Full hazmat suit and SCBA
Gloves and eye protection (Correct answer)
Gloves only when bleeding is visible
N95 respirator, gown, gloves, and face shield for all patients

Correct answer: Gloves and eye protection

Standard precautions for trauma require gloves and eye protection at minimum due to risk of blood and body fluid exposure.

Question 8: At a mass casualty incident with 15 patients from a bus crash, which resource request should be made first?

Request a medical helicopter for every critical patient
Establish command, declare an MCI, and request additional resources early (Correct answer)
Begin transporting patients before establishing command
Wait for a full patient count before calling for help

Correct answer: Establish command, declare an MCI, and request additional resources early

Early declaration of an MCI and immediate resource requests prevent delays that worsen outcomes in mass casualty events.

Question 9: A provider notes a strong smell of natural gas upon entering a residential structure. What is the immediate action?

Ventilate the structure by opening windows before continuing assessment
Evacuate all occupants and call the gas utility from outside (Correct answer)
Use a radio inside to call dispatch for guidance
Check the patient first, then address the gas leak

Correct answer: Evacuate all occupants and call the gas utility from outside

Natural gas creates an explosive atmosphere; immediate evacuation and external notification are required before any other action.

Question 10: Which factor most commonly causes EMS providers to overlook scene hazards?

Inadequate PPE supply
Tunnel vision focused on the patient rather than the environment (Correct answer)
Insufficient training on hazardous materials
Poor lighting at night scenes

Correct answer: Tunnel vision focused on the patient rather than the environment

Tunnel vision — focusing entirely on the patient — is the most common cause of missed scene hazards in EMS.

Question 11: During a farm accident, a patient is trapped under agricultural equipment with a running diesel engine nearby. What hazard requires immediate attention?

Risk of hydraulic fluid skin irritation
Carbon monoxide accumulation in a low-lying area (Correct answer)
Sunburn risk for rescuers
Potential for agricultural dust inhalation

Correct answer: Carbon monoxide accumulation in a low-lying area

Diesel engines in enclosed or low-lying areas produce carbon monoxide that accumulates rapidly and can incapacitate rescuers and patients.

Question 12: A provider receives a dispatch for a 'man down' in an alley. Which approach is safest?

Drive directly to the alley entrance and exit the vehicle immediately
Approach on foot from a parallel street for initial scene observation (Correct answer)
Call the patient's cell phone to assess safety before arrival
Park at the alley entrance with emergency lights off

Correct answer: Approach on foot from a parallel street for initial scene observation

Approaching from an observation angle before committing allows providers to assess scene safety without placing themselves in a potentially dangerous position.

Question 13: Which situation requires the EMS provider to wear a high-visibility vest in addition to standard PPE?

Any indoor patient contact in a private residence
Working on or near active roadways (Correct answer)
Treating patients at a sports venue
Transporting patients in the ambulance

Correct answer: Working on or near active roadways

High-visibility vests are required when working on or near active roadways to reduce the risk of being struck by passing vehicles.

Question 14: When evaluating mechanism of injury (MOI) at a scene, what is the primary reason for doing so?

To determine billing codes for the transport
To anticipate potential injuries even before they are clinically apparent (Correct answer)
To identify the responsible party for legal documentation
To decide which hospital has the appropriate specialty care

Correct answer: To anticipate potential injuries even before they are clinically apparent

Understanding MOI allows providers to anticipate occult injuries and maintain a high index of suspicion during assessment.

Question 15: A hazmat placard shows the number 1203. Without a reference guide, what does this indicate?

The substance requires water for decontamination
The material is a flammable liquid (gasoline) (Correct answer)
The container holds more than 1,000 liters
The substance is a non-hazardous petroleum product

Correct answer: The material is a flammable liquid (gasoline)

UN placard number 1203 designates gasoline, a flammable liquid requiring specific isolation and approach distances.

Question 16: The Emergency Response Guidebook (ERG) recommends an initial isolation distance for a flammable liquid spill of 330 feet. This distance applies to:

Only the downwind direction from the spill
All directions around the spill as a minimum safe radius (Correct answer)
Personnel in full encapsulating suits only
Only nighttime incidents when vapors accumulate

Correct answer: All directions around the spill as a minimum safe radius

ERG isolation distances apply in all directions around the spill, establishing a minimum safe perimeter for all responders.

Question 17: At a trauma scene involving downed electrical wires, the recommended safe distance from the wire is:

10 feet, as household current drops quickly with distance
At least one full span (pole to pole) in all directions (Correct answer)
The distance at which the wire is no longer visible
Only as far as needed to avoid direct contact with the wire

Correct answer: At least one full span (pole to pole) in all directions

A downed energized wire can energize the ground over a wide radius; one full span (pole to pole) in all directions is the minimum safe distance.

Question 18: Which statement best describes 'upwind and uphill' positioning at a hazmat scene?

It ensures providers can see the entire scene from an elevated vantage point
It minimizes exposure to toxic vapors that travel downhill and downwind (Correct answer)
It allows providers to approach patients more quickly
It improves radio communication with incident command

Correct answer: It minimizes exposure to toxic vapors that travel downhill and downwind

Positioning upwind and uphill keeps responders out of the path of toxic vapors and contaminated runoff.

Question 19: A provider is called to an industrial site where workers report dizziness and nausea with no apparent trauma. What scene safety consideration is paramount?

Determining which supervisor to notify
Identifying possible toxic inhalation before entering (Correct answer)
Assessing the patients' vital signs remotely
Checking workers' compensation paperwork

Correct answer: Identifying possible toxic inhalation before entering

Multiple patients with similar symptoms at an industrial site strongly suggests toxic exposure; entry requires hazmat assessment and appropriate PPE.

Question 20: During a structural collapse rescue, which team has authority over EMS entry into the collapse zone?

The senior EMS provider on scene
The structural/technical rescue incident commander (Correct answer)
The first-arriving fire engine officer
Medical direction via radio

Correct answer: The structural/technical rescue incident commander

At structural collapse scenes, the technical rescue incident commander controls entry into the collapse zone based on structural safety assessments.

Question 21: A patient involved in a chemical plant explosion has an unknown powder on their clothing. The provider's first action should be:

Remove clothing and brush off powder using bare hands
Begin decontamination by flushing with large amounts of water immediately
Don appropriate PPE before approaching and contact hazmat (Correct answer)
Apply a decontamination solution from the ambulance drug kit

Correct answer: Don appropriate PPE before approaching and contact hazmat

Donning appropriate PPE and contacting hazmat before patient contact prevents secondary contamination of providers.

PHTLS Scene Assessment and Safety

During a multi-vehicle collision at night, which action best protects EMS providers while maintaining patient access?

🃏 PHTLS Flashcards — Study This Quiz as Flip Cards →

📚 Want to go deeper? Read the Full PHTLS Study Guide →

What Practice Test Geeks adds beyond an AI chat for PHTLS

An AI chatbot can quiz you, but it can't reproduce the exam conditions or keep your record. Here you get:

A timed, full-length PHTLS mock exam — 50 questions in 60 minutes with a 76% pass mark, modeled on the official exam's question count and time limit, followed by a score report broken down by exam domain.
A fixed PHTLS question bank: the same test every attempt, so your score is comparable from one try to the next instead of changing with every regenerated quiz.
Progress saved on your device: completed tests, scores and missed questions stay in My Progress, so you can retake only what you got wrong.
A printable PHTLS cheat sheet you can print or save as a PDF.
PHTLS flashcards built from the same question bank.

Start the Timed PHTLS Mock Exam →

These practice questions were written with AI tools. They are not real exam questions. Exam facts are checked against the official sources listed below. Not reviewed by a subject-matter expert. Editorial policy

Sources & references

Exam facts on this page (fees, format, dates, passing scores) are checked against these official sources; the date is our last check. Editorial policy

facs.org — Eligibility · verified Oct 2026
naemt.org — Fees, retake policy, score release, test delivery, eligibility, renewal, score validity · verified Oct 2026