For a Clostridium difficile stool collection, which transport statement is correct?

• A. Always freeze the sample.
• B. Transport to the laboratory at room temperature or refrigerated at 4°C for delivery within 24 hours.
• C. Store at 37°C.
• D. Send without any fixative.

Answer: (B)

Maintaining specimen stability during transport is essential for accurate Clostridioides difficile testing. The best practice is to deliver the stool to the lab either at room temperature or refrigerated at 4°C, with a goal of arriving within 24 hours. This window helps preserve both the organism and any detectable markers (like DNA or toxins) for the assays the lab will use, whether culture, molecular testing, or toxin detection. Temperature control prevents overgrowth of other bacteria and minimizes degradation that could affect results.

Options that require freezing are not the standard for routine transport because freezing can alter the sample in ways that affect certain tests, and storing at body temperature is neither practical nor appropriate for transport, as it promotes rapid changes in the specimen. Sending without any preservative doesn’t align with the typical transport guidelines either, since maintaining a stable environment during transit is important for test reliability.