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The international agreements are the basis for establishing the global metrological traceability at different measurement levels. The concepts and concept relations around metrological traceability are presented. An important element of providing the metrological traceability is the evaluation of measurement uncertainty. The procedure of linking of key and supplementary comparison results is described. Linking of key and supplementary comparison results of the Regional Metrology Organization for some quantities according to the described procedure was presented. Results for all participants of presented key and supplementary comparisons are satisfactory for chi-square test and E n number. The procedure of linking of key or supplementary comparison and national inter-laboratory comparison results is described. This procedure can be used for practical evaluation of specific interlaboratory comparison results on a national level in different countries by means of laboratory results of the National Metrology Institute and Designated Institute. This procedure can contribute the mutual recognition of measurement and testing results by different countries. Linking of key comparison and inter-laboratory comparison results for some quantities according to the described procedure was presented. Results for all participants of presented key comparison and interlaboratory comparison are satisfactory for chi-square test, E n number, z scores and ζ scores.

The number of calibration (CL) and testing (TL) laboratories accredited by NAAU is increasing annually. By the end of 2017, more than 440 TL and 19 CL have been accredited in Ukraine. These labs can apply the International Laboratory Accreditation Cooperation (ILAC) logo on their certificates and protocols. Such certificates and protocols are recognized by more than 80 countries of the world, since NAAU is a signatory to the Mutual Recognition Agreement (ILAC MRA) in the areas of accreditation of TL and CL. This is one of the important elements for increasing the competitiveness of Ukrainian products in world markets.National accreditation agencies of laboratories have set strict requirements for the accreditation of CL or TL. Laboratories are required to participate in the relevant ICs:-CL -in each type of measurement and in each kind of measurable value, which are introduced into the project of accreditation; 4