1) The right formulation:

· Tryptic Soy Agar (TSA) → general growth medium

· Neutralizers (e.g., lecithin and polysorbate 80) → to inactivate common disinfectant residues and avoid false negatives

2) Proven quality and documentation:

· Lot-specific Certificate of Analysis (COA) → must include growth promotion, sterility, and pH data

· Traceability → lot and expiration date on every package and sampling device

3) Storage and packaging:

· Room temperature storage → typically offers longer expiration dates

· Cleanroom packaging → peace of mind

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