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How to state Air / Yeast & Mould count ?

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Posted 05 March 2020 - 05:17 AM


Please do help me understand on my query.

If for example, the actual result of YM for Air test is 8 cfu..

How do I state it in the report.

Thank you for your support




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Posted 05 March 2020 - 08:15 AM

How have you performed the test that generated the 8cfu result?

Was this a plate or an air sampler?
Broadly you're trying to answer the question: 8 cfu "per what"?

For example if it's a plate then you know (or can calculate) the surface area, and you know how long you exposed it for the sampling process, so you can fairly readily turn your result into a cfu per m2 per hour figure (or similar).

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Posted 05 March 2020 - 12:24 PM

In addition to pHruit's advice If this is compressed air, the pressure should be reported. Sampling devices are usually calibrated to a specific plate at a specific PSI (kPa, or Bar).




*Method - Isolated Plates exposed to Air Compressor Air for

a period of 20 seconds at 40 PSI pressure.

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Posted 11 March 2020 - 06:23 PM

Are you talking about environmental air testing or compressed air testing? We use 3M Rapid Yeast and Mold Petrifilm plates for our compressed air testing and since we manufacture packaging, we are excluded from the environmental air testing. I would think you would need a high count threshold "The target is a count of 10 or less per 4 sq in" or whatever the medium size you are using indicates it should be. Sampling method, locations, duration of exposure, hydration method (if applicable) and supplies, person performing sampling, person verifying the sampling was carried out etc.

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