Methods to Test the Efficacy of Sterilization
Monitoring the efficacy of sterilization processes is essential to guarantee the elimination of all microbial life, including resistant bacterial spores.
| Indicator Type | Description |
|---|---|
| Biological Indicators (BIs) | These are the most definitive monitors as they directly assess the destruction of highly resistant microbial spores. Geobacillus stearothermophilus is used for steam/autoclave monitoring, while Bacillus atrophaeus is used for ETO and dry heat processes. |
| Chemical Indicators (CIs) | These provide evidence of exposure to specific sterilization conditions (temperature, time, steam). External indicators (e.g., autoclave tape) confirm processing, while internal indicators verify parameters met within the package. |
NEET PG High-Yield Clinical Note
Biological indicators are the gold standard because they confirm the actual destruction of bacterial spores. A positive result on a biological indicator indicates a sterilization failure, necessitating an immediate recall of all items processed in that batch.
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