DOMAIN LEARNING GUIDE

Scene Size-Up and Safety

Begin before patient contact. Identify hazards, decide what resources are needed, and protect the people providing care.

Practice this section Untimed questions with explanations after each answer.

Use these concepts for active recall

These introductory lessons cover selected concepts in this domain. Read each source-linked explanation, answer the recall question in your own words, then open the reasoning check. Use your EMT course and the cited guidance for the wider topic.

PUBLIC CORE CONCEPT

Possible hazardous atmosphere

A running engine in an enclosed workspace creates a credible carbon monoxide hazard. Prevent additional exposures and obtain a safe rescue capability before entry.

CDC/NIOSH: Carbon Monoxide Hazards at Work — Overview, Exposure, Risks, and Equipment users NREMT EMT examination specifications — 2025 examination; content tasks pp. 2–3 and formats pp. 5–6

CHECK YOUR RECALL

What makes the enclosed workspace unsafe before you make patient contact?

Compare your reasoning

Name the running engine and enclosed space as the exposure clues. A patient needing help does not remove the hazard; your explanation should include preventing further exposure and obtaining a safe rescue capability.

PUBLIC CORE CONCEPT

PPE based on exposure

Standard Precautions apply to every patient. Expected contact and splash exposure determine protection, including protection of the eyes, nose, and mouth when indicated.

CDC: Standard Precautions for All Patient Care — What to know; PPE and equipment recommendations OSHA: Bloodborne pathogens standard — 1910.1030(b), (d)(2), (d)(3), (d)(4)(ii)(D), and (d)(4)(iii)(A)

CHECK YOUR RECALL

How would expected splash exposure change your PPE choice?

Compare your reasoning

Base the protection on the contact you anticipate. When a splash could reach the face, gloves alone do not protect the eyes, nose and mouth. The source explains how Standard Precautions apply across patients.

PUBLIC CORE CONCEPT

Contaminated broken glass

Contaminated broken glass should be collected mechanically. Examination gloves do not turn hand collection into a safe sharps-handling method.

OSHA: Bloodborne pathogens standard — 1910.1030(b), (d)(2), (d)(3), (d)(4)(ii)(D), and (d)(4)(iii)(A)

CHECK YOUR RECALL

Why are examination gloves insufficient for collecting contaminated broken glass by hand?

Compare your reasoning

Identify the sharp object as well as the contamination. Gloves do not make direct hand collection safe; explain how a mechanical collection method avoids that handling risk.

Use the concept in a fresh decision

Before opening the answer explanation, name the clue that changes the priority and explain why your second-choice response is less suitable. Revisit the source when the distinction remains unclear.

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