What the measurements describe
Protein, fat, moisture and ash summarize important parts of a food’s composition. Ash is inorganic residue under the method conditions; it is not a list of individual minerals.
Match the method to the food
Different foods and ingredients may need different preparation. For protein determined from nitrogen, the conversion factor belongs with the product context. Give the laboratory the actual matrix and testing objective.
Prepare a useful comparison
Keep product version, processing, moisture basis and serving information consistent. A dried version and a ready-to-eat version can differ substantially even when they come from the same formulation.
Use the report
Compare like reporting bases. If the purpose is a specification or nutrition label, identify the basis needed before testing so that interpretation does not rely on assumptions after the result arrives.
Related testing & guidance
Technical & service references
Vanguard service detailsSource review: November 8, 2026. The agreed method and project scope govern the testing.