What is the difference between standard precautions and transmission-based precautions?

• A. Standard precautions apply to all patients; transmission-based precautions are extra measures for specific infections.
• B. Standard precautions are optional and only used in some settings.
• C. Standard precautions are used for surgical procedures only.
• D. Standard precautions apply to all patients who have known infections.

Answer: (D)

The main idea is understanding how infection prevention uses universal measures versus extra measures for specific infections. Standard precautions are the baseline practices used with every patient, every time. They assume that infectious agents can be present in blood, body fluids, secretions, excretions, mucous membranes, or on contaminated surfaces, so you perform thorough hand hygiene, wear gloves when touching bodily fluids, use other PPE as needed by the task, and follow safe needle and sharps handling, plus routine environmental cleaning and respiratory hygiene. These precautions are not optional and do not depend on knowing a patient’s infection status.

Transmission-based precautions are layered on top of standard precautions when a patient has a known or suspected infection that could spread in a particular way. They’re chosen based on how the organism transmits—through contact, droplets, or airborne routes—and they add specific barriers beyond standard precautions. For example, contact precautions involve gloves and a gown; droplet precautions add a mask for close contact; airborne precautions require a fit-tested respirator and a specialized room. The idea is to add targeted protections for specific infections to prevent spread, while standard precautions handle routine, universal safety.