Which statement is NOT a recommended practice when transporting samples to external labs?

• A. Keep samples cool if required
• B. Seal and label
• C. Use appropriate preservative
• D. Transport without time constraints

Answer: (D)

Maintaining sample integrity during transport hinges on proper handling: temperature control, clear sealing and labeling, and the use of appropriate preservatives. Keeping samples cool when required slows degradation and preserves the analytes; sealing and labeling prevents leaks and ensures the correct sample is tracked; using the right preservative stabilizes the material so it remains analyzable during transit. Transport without time constraints isn’t a recommended practice because many samples have limited stability. Delays can lead to degradation, inaccurate results, or safety and regulatory issues. Therefore, the statement about transporting without time constraints doesn’t fit best practices.