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Sample (sample): one or several parts taken from a system, intended for obtaining information about the system and often serving as a basis for making decisions regarding the system or its operation.
Example – A volume (portion) of serum taken from a larger volume of serum
Source: "Medical Laboratories. Particular Requirements for Quality and Competence. GOST R ISO 15189-2009"
(approved by the order of Rosstandart dated 09.12.2009 No. 629-st)