How long are laboratory retention samples kept?
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1 Answer: CNAS and CMA do not specify a mandatory duration for keeping sample backups. Unless there are special regulations for certain industries, the retention time is determined according to the requirements of the laboratory itself. The retention time of samples takes into account the following three factors: 1. Meeting the requirements for retesting (being able to adhere to the time limit for retesting); 2. Meeting the requirements of specific industries, such as the judicial sector, which requires samples to be retained indefinitely. 3. Considering the specific conditions of the laboratory and storage requirements, for example in jewelry testing, it is better if samples are kept in the laboratory for as short a time as possible. 2. How to handle the retained samples? 1. Handle them yourself: It depends on the characteristics of the samples; if you are unable to handle them, you can seek external help. You can agree on the costs with the customer in advance, or bear the expenses yourself. 2. Return to the customer: If the retention period has expired and the customer fails to take samples within the specified time, the laboratory can set a basic retention period; there will be additional fees for any delay, and the customer is urged to process the samples as soon as possible.
Note: CNAS and CMA refer to the China National Accreditation Service for Conformity Assessment and the China Metrology Certification Committee, respectively. .
For some customers, the samples inspected need to be collected, while those from less valuable clients do not require collection and can be handled by them themselves. Storing data for too long incurs costs and may also pose certain risks.
Yes, that’s why it can be dealt with as soon as possible; there’s no need to keep it for too long