During stool collection for C. difficile testing, what is the purpose of shaking the sample after adding fixative?

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Multiple Choice

During stool collection for C. difficile testing, what is the purpose of shaking the sample after adding fixative?

Explanation:
Shaking after adding fixative is done to make sure the fixative is well mixed with the stool. This ensures uniform contact throughout the sample, so every part is preserved consistently. Uniform fixation helps maintain the integrity of any C. difficile organisms or their components (such as DNA or toxins) for reliable downstream testing, and it also helps break up clumps so the fixative can penetrate all material. It is not about activating the fixative, sterilizing the sample, or measuring pH.

Shaking after adding fixative is done to make sure the fixative is well mixed with the stool. This ensures uniform contact throughout the sample, so every part is preserved consistently. Uniform fixation helps maintain the integrity of any C. difficile organisms or their components (such as DNA or toxins) for reliable downstream testing, and it also helps break up clumps so the fixative can penetrate all material. It is not about activating the fixative, sterilizing the sample, or measuring pH.

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