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QC Test Suspensions

Crosstex Quality Control (QC) Test Suspensions are ready-to-use microbial suspensions containing a consistent number of microorganisms delivering exceptional accuracy for Qualitative Microbiological Quality Control. A large number of strains are available for applications in the pharmaceutical, medical device, food and water testing industries. QC Test Suspensions can be used as qualitative reference standards in most USP, EP and JP industry methods and pharmacopeial chapters.

  • All suspensions comply with the requirement f or population of <100 colony forming units (CFUs) and are guaranteed to be within five passages of an original stock culture
  • QC Test Suspensions are provided as pure cultures in 2.5 mL or 10 mL volumes containing 25 or 100 doses (0.1 mL each)
  • Store suspensions under refrigerated conditions between 2˚C to 8˚C
  • QC Test Suspensions are sold in glass vials with screw-top caps containing a septum. The screw-top cap with septum allows for access using either a pipette or a needle and syringe
  • The organisms can be used to manufacture suspensions with population levels up to 106 /0.1 mL or higher. Please inquire for information on population levels greater than 100 (CFU’s) /0.1 mL for the QC Test Suspension organisms

Some of the most common testing applications are listed below:

Growth Media Testing
QC Test Suspensions provide a quality control challenge to each batch or lot of medium, ensuring its growth promoting qualities, whether it is prepared internally from basic ingredients or purchased commercially prepared. Inoculate each batch or lot of medium directly without rehydration, dilution or reconstitution. Visible growth after incubation indicates the culture medium is conducive to organism growth.

Sterility Assurance Testing
QC Test Suspensions meet the requirements of USP <71>, EP 2.6.1 and JP 4.06 Sterility Tests.

Antimicrobial Effectiveness Testing
QC Test Suspensions can be used when antimicrobial activity is required to prevent microbial proliferation or to limit the effect of contamination.

Crosstex Code Organism Cell Line Shelf Life Vial Size
GP-01 Bacillus subtilis 6633 14 months 10 mL
GP-02 Clostridium sporogenes 11437 14 months 10 mL
GP25-03 Candida albicans 10231 90 days 2.5 mL
GP-04 Aspergillus brasiliensis 16404 7 months 10 mL
GP-06 Geobacillus stearothermophilus 7953 24 months 10 mL
GP25-07 Pseudomonas aeruginosa 9027 8 weeks 2.5 mL
GP25-08 Staphylococcus aureus 6538 2 months 2.5 mL
GP25-09 Escherichia coli 8739 10 weeks 2.5 mL
GP-10 Bacillus atrophaeus 9372 18 months 10 mL
GP25-11 Salmonella enterica 14028 12 weeks 2.5 mL
Number of Passages from Source ≤5
Standardized Population ≤100 Colony Forming Units (CFU’s)/0.1 mL
Purity No evidence of contamination with other microorganisms

Technical Data Sheet:


Safety Data Sheet:



52ff0e80b07d28b590bbc4b30befde52 Crosstex QC Test Suspensions (Growth Promotion)