Why is proper labeling of cages and samples essential?

• A. To ensure correct animal ID, prevent mix-ups, and facilitate data integrity and traceability.
• B. To decorate cages.
• C. To confuse handlers.
• D. To comply with random labeling.

Answer: (A)

Correct labeling ties every animal and its samples to a unique identity and to the specific study parameters over time. When each cage and sample carries a clear, durable ID, you can reliably link observations, treatments, and data to the right animal, ensuring data integrity and traceability from housing through analysis. This reduces the risk of mix-ups, enables a true audit trail of who handled what and when, and supports regulatory and ethical compliance. Labels should be standardized and legible, and include essential information such as a unique animal ID, strain, sex, age or weight, arrival date, cage number, study ID, treatment group, date, and sample type, with a barcode or RFID when possible to minimize manual errors. If animals move between cages or groups, labeling must reflect the new status to prevent data contamination. Poor labeling can lead to misidentification, incorrect data, wasted animals, and welfare and compliance issues.