traceability “Traceability” means that the measurement results can be related to a stated reference by an unbroken chain of accredited comparisons. The stated reference usually refers to national or international standards. Traceability gives the user confidence that his/her measurements agree with the National Standards within the stated uncertainty. It also ensures that the measurements will be equivalent to those made using different instruments from different suppliers. However, in chemical and microbiological measurements, it is very difficult to follow the metrological traceability practiced in physical arena. Measurement results of these laboratories are traceable to the International System of Units (SI) through calibration provided by a competent lab, or use of certified values of CRM provided by a competent provider, or direct realization of the SI units ensured by comparison, directly or indirectly, with national or international standards.
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