A positive biological indicator test indicates that the sterilization process did what?

• A. Was completed successfully
• B. Did not result in the death of all the test organisms
• C. Is ready for immediate use
• D. Is effective against spores

Answer: (B)

A positive biological indicator test signifies that the sterilization process did not achieve its intended purpose of killing all the microorganisms present, particularly the spores used in the test. Biological indicators contain highly resistant spores, often of organisms like Bacillus stearothermophilus or Bacillus subtilis, that are used to challenge the efficacy of the sterilization methods.

When a biological indicator returns a positive result, it means that viable spores are still present following the sterilization cycle, thus indicating a failure or deficiency in the sterilization process. This outcome alerts sterile processing professionals to investigate the procedure, equipment, and loads to identify what went wrong, ensuring that the items cannot be safely considered sterile for patient use.

In contrast, the other options reflect outcomes of correct or beneficial processes rather than a failure, which is why they do not align with the implications of a positive biological indicator test.