Name the targets
Lead, cadmium, arsenic and mercury are separate analytes. A testing request should name the elements and, where relevant, distinguish total concentration from a specific chemical form.
Choose the sample context
Identify the food or ingredient, source and processing stage. A supplier-qualification sample and a finished-product result serve different purposes and should remain traceable to their lots.
Set the reporting basis
Agree the units and reporting limits required for the intended decision. Per-serving calculations require the correct serving mass or volume and product preparation.
Apply criteria separately
A concentration result does not establish universal compliance across every market or product category. Provide the relevant customer specification or program requirements as part of the scope.
Related testing & guidance
Technical & service references
Vanguard food & beverage servicesFDA: Bacteriological Analytical ManualVanguard nutrition & proximate analysisSource review: November 8, 2026. The agreed method and project scope govern the testing.