In the context of clinical microbiology, why must culture and endotoxin samples be received by the laboratory promptly after collection?

• A. To ensure that all samples are mixed with preservatives before testing
• B. To allow samples to reach room temperature before analysis
• C. To prevent degradation or contamination that could affect test results
• D. To reduce the need for refrigeration during transport

Answer: (C)

Verified step by step guidance

1. Understand that clinical microbiology samples, such as culture and endotoxin samples, are sensitive to changes after collection.
2. Recognize that prompt delivery to the laboratory helps prevent degradation of the sample, which means the biological components remain intact and viable for accurate testing.
3. Consider that delays can lead to contamination by other microorganisms or environmental factors, which can alter the test results and lead to false positives or negatives.
4. Note that preservatives are not always added immediately, so timely processing reduces the risk of sample deterioration before any preservation steps.
5. Conclude that the main reason for prompt receipt is to maintain sample integrity, ensuring reliable and accurate laboratory analysis.