Standard precautions and transmission-based precautions

Introduction

Infection prevention begins with one truth; every client, every fluid, every surface could carry risk. That mindset defines standard precautions, the foundation of all nursing safety. When known or suspected pathogens enter the picture, transmission-based precautions add extra layers of protection. Together, these form the shield between healthcare providers and preventable infection.

Learning objectives

By the end of this section, you should be able to:

• Differentiate between standard and transmission-based precautions
• Identify correct PPE for airborne, droplet, and contact precautions
• Apply safe transport, cleaning, and client-education practices

Precaution classifications

There are two main classifications for precautions. Within these, standard precautions form the universal defense in healthcare, applying to all clients, while transmission-based precautions add specific protective measures when known or suspected pathogens are present, targeting their routes of spread.

//////Caption: Standard and transmission-based precautions

Illustration type: Flowchart infographic

Illustration note: Show Standard Precautions as the foundation applied to every client, branching into Airborne, Droplet, Contact, and Protective (Reverse) Isolation with brief icons representing each.///////

Standard precautions

Standard precautions apply to every client, regardless of diagnosis or perceived infection status.

• Perform hand hygiene before and after contact with each client
• Use gloves, gowns, masks, and eye protection when risk of exposure exists
• Follow respiratory hygiene/cough etiquette
• Practice safe injection and needle disposal
• Handle contaminated equipment, linens, and specimens carefully, assuming all body fluids (except sweat) are potentially infectious

Clinical vignette: A nurse changes a dressing on a post-op wound. Gloves are required because contact with blood is possible, even if the client has no history of infection. Gloves protect both the client and the nurse.

Transmission-based precautions

When a client has or is suspected of having an infection spread by a specific route, nurses must apply additional protective measures beyond standard precautions. These precautions (airborne, droplet, and contact) target the exact way pathogens travel to prevent transmission.

Airborne precautions: Used for infections that spread through fine particles (<5 microns) that remain suspended in the air for long periods. These pathogens can travel across distances, so clients require a negative-pressure room, and staff must wear an N95 respirator or higher-level protection.

Droplet precautions: Applied when pathogens are spread through respiratory droplets (>5 microns) expelled during coughing, sneezing, or talking. Because droplets fall within about 3 feet, nurses must wear a surgical mask within close proximity and ensure the client wears a mask when transported.

Contact precautions: For infections spread by direct touch or contact with contaminated surfaces. Nurses wear gloves and a gown upon room entry and during contact with the client or the client’s environment. Use soap and water hand hygiene, particularly for spore-forming organisms such as C. difficile, because alcohol-based hand sanitizers are less effective against spores.

Protective (reverse) isolation: Protective precautions safeguard immunocompromised clients from external pathogens. These clients require a positive-pressure room, meticulous hand hygiene, and restrictions on fresh flowers, raw foods, or sick visitors.

//////Caption: Transmission-based precautions at a glance

Illustration type: Comparison table infographic

Illustration note: Compare Airborne, Droplet, Contact, and Protective Isolation using columns for Route of Transmission, PPE, Room Type, and Common Examples.///////

NGN tip:

Remember! Standard precautions are always used. Transmission-based precautions are added when indicated.

Definitions

Negative-pressure room

Air flows into the client’s room but not out, preventing airborne pathogens from escaping into hallways. Used for infections like tuberculosis, measles, and varicella. (think sucking in air)

Positive-pressure room

Air flows out of the client’s room but not in, protecting immunocompromised clients from outside contaminants. Used for neutropenic, transplant, and chemotherapy clients. (think blowing out air)

//////Caption: Negative-pressure versus positive-pressure rooms

Illustration type: Side-by-side diagram

Illustration note: Illustrate airflow entering a negative-pressure room and exiting a positive-pressure room, with example clients (TB for negative pressure; neutropenic client for positive pressure).///////

Nursing interventions

• Hand hygiene: Use alcohol-based rubs unless caring for C. difficile (requires soap & water)

• PPE sequence:

  • Don: Gown → mask/respirator → goggles/face shield → gloves
  • Doff: Gloves → goggles/face shield → gown → mask/respirator

• Client transport: Limit movement; mask airborne/droplet patients; cover wounds for contact isolation

• Equipment: Dedicate or disinfect shared items between clients

• Environmental cleaning: High-touch surfaces and bathrooms need frequent disinfection

• Specimen handling: Label accurately and place in biohazard bags

Donning PPE:

1️⃣ Gown → 2️⃣ Mask/Respirator → 3️⃣ Goggles/Face Shield → 4️⃣ Gloves

Doffing PPE:

1️⃣ Gloves → 2️⃣ Goggles/Face Shield → 3️⃣ Gown → 4️⃣ Mask

NGN tip:

Remove gloves first. They’re the dirtiest. Perform hand hygiene between steps if contamination occurs.

Remove mask/respirator last outside if applicable.

//////Caption: Correct PPE donning and doffing sequence

Illustration type: Step-by-step infographic

Illustration note: Show the correct order for donning (Gown → Mask/Respirator → Goggles/Face Shield → Gloves) and doffing (Gloves → Goggles/Face Shield → Gown → Mask/Respirator), emphasizing removal of gloves first and the mask last.///////

Clinical vignette: A client with MRSA is moved to radiology. The nurse covers draining wounds, notifies receiving staff, and ensures surfaces are disinfected afterward.

Client and family education

• Explain the reason for isolation calmly; emphasize protection, not punishment
• Teach proper handwashing and PPE use before entering/leaving the room
• Encourage compliance to reduce cross-contamination anxiety

Common pitfalls on the NCLEX

• Using alcohol-based hand rub instead of soap and water for C. difficile, where soap and water is required, or during norovirus outbreaks, where soap and water is preferred because alcohol-based hand rubs are less effective against non-enveloped viruses.
• Forgetting to remove PPE before leaving isolation rooms (contaminates the hallway).
• Using surgical masks instead of N95s for airborne precautions.
• Transporting infected clients without notifying receiving departments.
• Assuming standard precautions aren’t needed for “clean” clients.