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The raw plate count results for standard agar plates should be within 25 to 250 colony forming units (CFU) or reported as an estimate. The recommended counting range for Aspergillus niger and other filamentous colonies is between 8 and 80 CFU per plate. If no colonies are found on the plates, the result should be reported as less than the sample dilution.
All test monitors display environmental and test control as defined by the alert and action levels described in the procedure. Any colonies that are found on the negative test monitor plates are compared to the test plates to see if there is contamination found in the test system. All observations are noted with the data (e.g., representative colonies). The positive test monitors, where applicable, display growth.
Procedure: An aliquot of the sample or appropriate dilution(s) is plated in triplicate on soybean casein digest agar for fungi. The samples are spread evenly with a sterile, bent, glass rod. The plates are allowed to dry at room temperature then inverted and incubated.
If you have additional questions about Standard Plate Count test services, or would like to consult with the experts at Nelson Labs, just send us a request or call us at +1 (801) 290-7500.