USP Proficiency Testing ProgramUSP PT Express

USP <61> Microbial Enumeration of Non-Sterile Products PT Express



Catalog Number:
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P-0921, P-0122, P-0422, PT Express

Product Details

Product Details

AVAILABLE DECEMBER 1st 2021! Quantitative Proficiency Test Express for Specified Microorganisms in Non-Sterile Products by USP <61> or equivalent. Samples are provided as two single-pellet vials plus two vials of talc powder.  Each vial of talc contains 10 grams per vial.  Participants will follow provided step-by-step instructions to prepare each sample for plating onto suitable microbiological media.  Participants will then quantify the microorganism present in the sample. This product is available year-round. It does not need to be ordered during an open PT Study.

The positive microorganism may be any of the following species Staphylococcus aureus, Bacillus subtilis,  Pseudomonas aeruginosa, Candida albicans, or Aspergillus brasiliensis.

USP PT Schedule

USP PT Schedule

Study Number Study Open Date Study Close Date
PH-0422 4/18/2022 07/15/2022*

Extended from 6/9/22

PH-0922 9/19/2022 11/18/2022
PH-0123 1/16/2023 3/17/2023
PH-0523 5/15/2023 6/14/2023



USP Harmonized Compendial Methods

USP Harmonized Compendial Methods


United States Pharmacopeia (USP) Ph. Eur, EP JP NSI Catalog Item Harmonized Description


 USP  <61>
Microbiological Examination of Non-sterile Products




JP <35> Microbial Limit Test




Microbial Enumeration of Non-sterile Products


USP <62>

Microbiological Examination of Non-sterile Products: Tests for Specified Microorganisms




JP <35> Microbial Limit Test




Test for Specified Microorganisms in Non-sterile Products


USP <71>

Sterility Testing




JP <4.06>




Sterility Test


USP <51>

Antimicrobial Effectiveness Testing




JP <19>




Preservative Efficacy Test