Testing and laboratory analyses are the evidential foundation of the HACCP system. If monitoring shows that critical limits are respected, analyses confirm that the measures are indeed effective. In school kitchens, where the goal is constant safety and reliability, a smartly planned analysis program provides transparency, rapid detection of deviations, and a basis for improvement.
Microbiological analyses assess the presence and level of microorganisms in food, surfaces, and, if necessary, in hand swabs. Examples include the total number of aerobic mesophilic bacteria, enterobacteria, E. coli, Staphylococcus aureus, Listeria monocytogenes. Sampling is carried out according to a plan: periodically or during special events (menu changes, incidents, new equipment). The results are compared with reference limits; deviations trigger corrective actions and retesting.
Chemical analyses are focused on allergens, residues of cleaning agents, and possible migration from packaging. In school nutrition, allergen safety is particularly important: correct labeling and separate handling. Analyses may include the presence of gluten in a dish, traces of nuts or milk, depending on the population and menu. When results show the presence of an allergen, cause analysis and improvements in separation, labeling, and cleaning are implemented.
Physical contaminants (metal, glass, plastic) are generally controlled by prevention (packaging integrity, visual inspections, magnetic traps), but can be subject to investigations during incidents. Documentation must show the path from event to resolution: record, batch isolation, notifications, improvements.
An effective analysis program requires a sampling plan: what to test, how often, where to sample, who is responsible, and how to handle samples. Maintaining the cold chain from collection to the laboratory is key for validity of the results. The chosen laboratory must be competent and preferably accredited; reports must be understandable and comparable over time.
Connection with documentation is direct: attaching results to records, noting report reference numbers, date, responsible person, and key findings. When deviations occur, corrective actions are triggered and a retesting date is set. Review of results in monthly audits shows trends—whether improvements are lasting or problems recur in certain stages of the process.
Digital tools can automate archiving and reminders for sampling, graphically display the history of results, and link analyses with monitoring (e.g., correlating temperatures with microbiological outcomes). However, the foundation remains a plan, discipline, and clear communication between the kitchen, management, and laboratory. This way, analyses become not just "paperwork" but an active tool for improving food safety in schools.