A proposal for a new term to describe traceability to a sample (original) (raw)
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Clinical Chemistry and Laboratory Medicine (CCLM)
ISO15189:2012 requires medical laboratories to document metrological traceability of their results. While the ISO17511:2003 standard on metrological traceability in laboratory medicine requires the use of the highest available level in the traceability chain, it recognizes that for many measurands there is no reference above the manufacturer’s selected measurement procedure and the manufacturer’s working calibrator. Some immunoassays, although they intend to measure the same quantity and may even refer to the same reference material, unfortunately produce different results because of differences in analytical selectivity as manufacturers select different epitopes and antibodies for the same analyte. In other cases, the cause is the use of reference materials, which are not commutable. The uncertainty associated with the result is another important aspect in metrological traceability implementation. As the measurement uncertainty on the clinical samples is influenced by the uncertain...
Traceability as a Tool in the Quality System
This project studies the quality system in a shrimp processing company in Iceland. The study focuses on traceability and safety for cooked peeled shrimp (Pandalus boreales) and how traceability is an important tool in this system. The quality system was studied by selecting chapters of the quality handbook, which are related to safety and traceability. The product traceability is ensured by identification and labelling of units in each link and record keeping. Samples are taken for microbiological testing during important steps of the processing line in order to verify the system. High quality and safe products are the result of an effective quality system based on the HACCP system and traceability as a part of the prerequisite programme helps to manage the system. The quality system at the shrimp processing company examined in this report aims at securing food safety and product traceability. The study confirms that it is possible to trace back and forward the history of the produc...
Measurement, 2007
This paper discusses a relational modeling of measurement which is complementary to the standard representational point of view: by focusing on the experimental character of the measurand-related comparison between objects, this modeling emphasizes the role of the measuring systems as the devices which operatively perform such a comparison. The non-idealities of the operation are formalized in terms of non-transitivity of the substitutability relation between measured objects, due to the uncertainty on the measurand value remaining after the measurement. The metrological structure of traceability is shown to be an effective solution to cope with the problem of the general non-transitivity of measurement results. A preliminary theory is introduced as a possible formalization for the presented model.