Different names answer different questions
Total coliforms, fecal coliforms and generic E. coli are not interchangeable test names. Pathogenic E. coli requires its own defined target and method. State which result your specification calls for.
Food, water and surfaces
The sample matrix affects preparation, method choice and reporting. Identify whether the request concerns a food product, a water sample or a production surface.
Count or presence/absence
Some projects need an enumeration result; others ask whether the target was detected in a stated portion. Agree this before testing so the report matches its intended use.
Keep collection controlled
Use the container or sampling device assigned to the project and identify each collection point. Holding conditions and delivery timing must suit the chosen test.
Related testing & guidance
Technical & service references
Vanguard microbiology service menuFDA: Bacteriological Analytical ManualUSP: General Chapter <61>Source review: November 8, 2026. The agreed method and project scope govern the testing.