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A 'sample' is defined as a unique unit sent in for examination of the same problem. A unit can be a single item (plant, plant part, soil, etc.), or multiple items of the same variety, taken from the same location and exhibiting the same problem. In the case of plants or produce, a sample should comprise 2 or 3 items showing a range of symptoms along with a couple of healthy looking items for comparison. Entirely dead material should not be submitted for testing.
† Services have been accredited by the United Kingdom Accreditation Service to BS/EN/ISO/IEC 17025:1999 General Requirements for the Competence of Testing and Calibration Laboratories for tests detailed in the schedule of accreditation number 1642 (available at http://www.ukas.org).