New York Associate Public Health Sanitarian Practice Test

Which of the following would compromise the integrity of a microbiological water sample?

Labeling clearly and using sterile containers Reusing non-sterile containers and not preserving Delivering promptly to the lab Cooling the sample when required

Correct Answer:

Reusing non-sterile containers and not preserving

Explanation:

Maintaining sample integrity means keeping the water sample uncontaminated and in the same condition as when collected until it’s analyzed. Reusing non-sterile containers and not preserving the sample introduces extraneous organisms and allows the sample to change before testing, both of which can distort microbial results. In contrast, using sterile containers, labeling properly, delivering promptly, and cooling when required all help preserve the original composition and viability of the sample, yielding accurate results.

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