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This example only shows test results for each constituent for one sample of one product that was tested. The sampling plan and testing plan including the number of samples of the products tested are determined by the sposnorsponsor. In reality, sponsors would have multiple product samples tested and those would be distinguished in the dataset. These sample identification information may be represented in PTREFID, and/ or PTSPID. In this example, SPTOBID indicated the product identification, and each sample of that product was numbered as Sample 1 thru Sample n. Many sponsor may use more specific codes to identify the source of product sample.          

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