Calibration program

Having a calibration programme is just part of the process to towards generating a valid result. It provides assurance that suitable equipment is being used and that results are traceable to SI units. Validation however is the process of providing objective evidence that a method can perform consistently to meet specified requirements that are adequate for the intended use of method. Requirements could be that a specific (low enough) detection level or high enough accuracy can be achieved. ISO 17025 also requires that a laboratory monitors and evaluates its performance by comparison with other laboratories, through proficiency testing (PT) or interlaboratory comparisons

All these activities are required to show technical competency.

For more information on what is required for ISO 17025, read the whitepaper Clause-by-clause explanation of ISO 17025:2017 available for download from https://advisera.com/17025academy/free-downloads/ and preview the toolkit at https://advisera.com/17025academy/iso-17025-documentation-toolkit/ which includes the Quality Assurance Procedure and the Proficiency Testing Record https://advisera.com/17025academy/documentation/proficiency-testing-record/

Thank you for your supporting. 

I have questions on the verification and validation method. How the lab select the verification method and measure the uncertainty ? 

You asked

How the lab select the verification method "

This depends on the type of test method and its purpose. I assume as you refer to verification, your laboratory is using a Standard Method. If not, you need to perform a more detailed validation.

Have a look at my explanation to the question “Which parameters will be verified for standard methods?” Methods verification at https://community.advisera.com/topic/methods-verification/

If you need more information on Validation, see my reply to Procedures for validation and verification of methods at https://community.advisera.com/topic/procedures-for-validation-and-verification-of-methods/

You also asked

How the lab measure the uncertainty ?"

For information on the use of the toolkit and additional technical expertise required to evaluate measurement uncertainty, have a look my reply to a previous question Measurement uncertainty in chemical process at https://community.advisera.com/topic/measurement-uncertainty-in-chemical-process/