Accreditation is the unbiased assessment by a third party of a Calibration Laboratory's / Centre's quality program and technical capabilities. The third party assesses the laboratory against a recognized standard

Accreditation indicates that a laboratory has demonstrated that it functions within the parameters of the standard. While accreditation is not a guarantee of a laboratory's performance, it does provide a means for determining the laboratory's competence to perform particular types of tests or calibrations. The technical evaluation during an accreditation includes a review (by experts in the relevant discipline) of calibration procedures, calibration standards, traceability, uncertainty analysis, actual results, and statistical process control). In India, NABL (National Accreditation Board for Testing & Calibration Laboratories) is entrusted with the task of assessing & accrediting Calibration Laboratories / Centres.