Which decontamination method destroys all microbes including spores on surgical instruments?

Appeared in: BTSC 3 August 2025

Explanation

Sterilisation is defined as a process that destroys or eliminates all forms of microbial life, including highly resistant bacterial spores.
This absolute level of microbial destruction is essential for items like surgical instruments that are intended to enter sterile parts of the body.
Common methods of sterilisation in healthcare include steam under pressure (autoclaving), ethylene oxide (ETO) gas, dry heat, and hydrogen peroxide plasma.
Failure to sterilize critical instruments properly poses a significant risk of transmitting infections to the patient.

Option A: Sanitisation only reduces the number of microorganisms to a level considered safe by public health standards; it does not eliminate all of them, and it is not effective against spores.
Option B: Disinfection eliminates most pathogenic microorganisms but does not reliably kill bacterial spores. It is a lower level of decontamination than sterilisation.
Option D: Antisepsis refers to the use of antimicrobial agents on living tissue (e.g., skin) to prevent infection. It is not used for decontaminating inanimate objects like surgical instruments.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Levels of Decontamination and Asepsis as background academic context rather than a clinical decision trigger.
Proper sterilisation of surgical instruments is a cornerstone of infection control, directly preventing Surgical Site Infections (SSIs), a major cause of morbidity and mortality.
Nurses working in operating rooms and central sterile supply departments (CSSD) must be experts in sterilisation processes, including monitoring effectiveness with biological and chemical indicators.
Understanding the difference between sterilisation, disinfection, and antisepsis is crucial for applying the correct level of decontamination based on an item's intended use, a concept known as Spaulding's Classification.

How to Approach the Question

First, identify the key terms in the question stem: "destroys all microbes" and "including spores".
These phrases point to the most absolute and effective form of decontamination.
Next, recall the definitions of the four options provided.
Sanitisation reduces microbial load to a 'safe' level.
Disinfection kills most pathogens but not spores.
Antisepsis is for use on living tissue.

Concept Tested & Keywords

Concept Tested: Levels of Decontamination and Asepsis
Stem keywords: decontamination method, destroys all microbes, spores, surgical instruments
Lead-in keywords: Which
Negative lead-in flag: false

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E6 Nursing Fundamentals Taylor p. 172-174

E6 Parks TextBook of Preventive & Social Medicine part 1 — Subpart A (pp 26-201 of 604) p. 126-128

E6 Microbiology OneStop Sastry p. 50-52

Practise the full BTSC 3 August 2025

Attempt every question from this paper in a timed mock, then review the full solution for each one.