The best and safest method of sterilization is:

AIIMS Nagpur NO- 2020

Applied Microbiology & Infection control

Easy

Appeared in: AIIMS Nagpur NO- 2020

Explanation

Autoclaving is considered the gold standard for sterilization in healthcare.
It utilizes moist heat in the form of steam under high pressure (e.g., 121°C at 15 psi) to destroy all forms of microbial life.
The key advantage is its ability to reliably kill highly resistant bacterial spores, which other methods like boiling cannot.
This process is validated, efficient, and safe for a wide range of medical equipment, ensuring items are free from viable microorganisms.

Option A: Boiling water reaches only 100°C, which is insufficient to destroy bacterial spores. Therefore, it is classified as a method of disinfection, not sterilization.
Option B: Flaming is a form of dry heat sterilization (incineration) that is destructive. It is not a practical, safe, or controllable method for sterilizing general medical or surgical equipment.
Option D: While some chemical solutions (chemical sterilants) can achieve sterilization, the process often requires very long immersion times (hours), can be toxic to staff, may leave harmful residues on instruments, and is generally considered less reliable than autoclaving.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Principles of Sterilization and Disinfection as background academic context rather than a clinical decision trigger.
Proper sterilization is a cornerstone of infection prevention and control, directly impacting patient safety by preventing surgical site infections (SSIs) and other healthcare-associated infections (HAIs).
Nurses are responsible for ensuring that instruments and equipment used for patient care are correctly processed, whether by sending them to a central sterile services department (CSSD) or by performing disinfection/sterilization in certain settings.
Understanding the difference between disinfection and sterilization is critical for selecting the appropriate method based on the item's intended use (e.g., critical, semi-critical, non-critical items).

How to Approach the Question

First, identify the key term in the question: 'sterilization'. Recall that sterilization means the complete elimination of all microorganisms, including highly resistant bacterial spores.
Next, analyze the lead-in words 'best and safest'. This requires you to compare the options not just on effectiveness but also on reliability and risk.
Evaluate each option against the definition of sterilization. Does it kill spores?
Eliminate 'Boiling' because it does not reliably kill spores.
Eliminate 'Flaming' as it is impractical and unsafe for general medical equipment.
Compare 'Autoclaving' and 'Immersion in chemical germicide'. While some chemicals can sterilize, autoclaving is generally faster, more reliable, and avoids the risks of chemical toxicity and residue.

Concept Tested & Keywords

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