USP <61> Test
Welcome to Antimicrobial Test Laboratories' USP <61> Test Method Resource Page.
Substantial changes to the historical USP <61> test method have been made recently, splitting out the "aerobic plate count" portion of the test from the microbial identifications and tests for specific organisms. As such, the summary below is very much simplified while we work to update it.
Note: The information below is presented for educational purposes only. The current, detailed USP 61 Method can be purchased from USP.
Summary of the USP <61> Microbial Limits Test
- A recovery analysis is performed to verify that microorganisms present in a sample can be adequatlly plated/recovered on the chosen agar medium.
- An aliquot of test specimen is dissolved in phosphate buffer (additional media containing emulsifying agents and/or surfactants may also be used).
- 1ml of the suspension is plated over agar plates and incubated.
- Microbial colonies are totaled and expressed as either CFU/g or CFU/ml of test specimen.
Antimicrobial Test Laboratories is pleased to offer USP <61> Testing as a part of its service portfolio, and as a complement to our USP <51> testing service.
For more information about the USP <61> Test, Contact the Lab Today!
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