I believe that many laboratories have encountered such an embarrassing situation: the standard expired, throwing or not throwing? In accordance with the requirements of CNAS accreditation guidelines, expired standards cannot be used for testing related to test result reports. But there are always a few standard products, the price is very expensive, but only a few times expired. So what if the standard is out of date? The following is a small edition of Bolinda to share with you about the expiration of standards.

What to do when the standard is expired:

First, basically according to CNAS or only destroy. However, if you wish, you can use it for internal quality control, that is, without notifying the personnel of the sample content, send them blind samples, let them do the inter-personnel comparative test, and then determine the results of the comparative test according to the relevant testing standards, which will help the internal quality control.

Second, do a period of verification to prove that these looks can be used, that is, the standard value has not changed greatly, or let the seller give you a certificate to show that the value is effective.

Third, expired standards used to do internal quality control is more appropriate, but there will be some laboratories used to do experiments, if there is a positive can be used within the validity of the standard to do an experiment.

4. The laboratory is used to explore experimental conditions and optimize parameters.

5, can be used in the validity period of the standard product re-marking, after re-marking as a control product.

The expired standard can not be used, because its purity can not meet the requirements, can only be dealt with separately.

The above content is the introduction of the standard expired how to do, in the process of use if the standard is found abnormal or large changes, should stop using the standard, and consider adopting more stringent packaging and storage methods or shorten its re-standard period and other measures.