Laboratories are generally accredited to ISO/IEC 17025 by an accreditation body. Accreditation recognises competence for the activities listed in the approved scope.

Testing, calibration and sampling laboratories may apply when they can demonstrate impartiality, competence and consistent operation for the proposed activities.

It is the formal list of tests, calibrations or sampling activities for which the laboratory has been assessed and recognised as competent.

Standard methods normally require verification that the laboratory can perform them properly. Nonstandard, modified or laboratory-developed methods may require more extensive validation.

Potentially. Each laboratory location, method, shared resource and technical responsibility must be defined and assessed within the proposed accreditation scope.

Laboratories must monitor the validity of results. Proficiency testing or interlaboratory comparison is commonly used where suitable programmes are available, together with other quality-control methods.

Timing depends on the number of methods, validation needs, equipment status, competence evidence, proficiency-testing availability and the laboratory's current system. For Yemen, the estimate should also account for dispersed operating locations and port and trading activity where relevant.

Assessors may review competence authorisations, methods, validation, uncertainty, equipment, traceability, environmental conditions, quality control, reports, audits and corrective actions.

Potentially, but each location, shared resource and technical activity must be clearly defined and assessed within the proposed scope.

The relevant accreditation body evaluates the laboratory and makes the independent accreditation decision.