Where averaging of separate tests is appropriately specified by the test method, a single averaged result can be reported as the final test result. The validity of averaging depends upon the sample and its purpose. Using averages in the case of microbiological assay can provide more accurate results because of the innate variability of the microbiological test system. For example the kinetic scan of individual wells or endotoxin data a number of consecutive measurements or with HPLC consecutive replicate injections the same preparation where the determination is considered one test one result.
