Mold Testing and Bacteria Testing

Trusted Laboratories

Trusted Laboratories

Phone: (905)290-9101
Toll Free: 1-866-813-0648

Worried About Mold?

Click ** Get Your Free Assessment Now!**

  • Home
  • About Us
  • Services
    • Mold Testing
    • Bacteria Testing
    • Legionella Testing
    • Cannabis Testing
    • Antimicrobial effectiveness testing
    • Biological Indicators and Sterilization Process
    • Contract Microbiological Research
    • Environmental Monitoring & Bioburden Testing
    • Material Fungus Resistance Testing
    • Materials Standard Testing
    • Cannabis Licence
  • Accreditation
  • Mold Test Kits
  • View Courses
  • Freebies
    • Live Presentations
    • FREE Mold Inspection Quiz
    • FREE Mold Spore Identification Quiz
  • Resources
    • Chain of Custody Form
    • Ask a Question
    • How to Take Samples
    • Results Interpretation
    • Mold and Bacteria Pictures
    • Jobs
  • Contact us
You are here: Home / Results Interpretation / How IAQ Professionals Can Improve Their Laboratory Reports

How IAQ Professionals Can Improve Their Laboratory Reports

Dr Jackson Kung'u

Currently there are no standardized methods for the analysis of indoor samples for microbial contamination. Neither are there guidelines for the limit of what is to be reported by laboratories and how to present the results.

Without guidelines reports from different laboratories are difficult to compare. The quality of laboratory reports is also sometimes compromised. Despite lack of standards and guidelines, the quality of laboratory reports could be improved with better communication between the IAQ professionals and the microbiologists.

While the microbiologists may be conversant with the biology, ecology and physiology of the organisms they deal with, it is possible that they may have very little knowledge or idea of what data would be most relevant to investigations on indoor microbial contamination.

Quality Microscope for Quality Service
Quality Microscope for Quality IAQ Service

Unlike with clinical samples where presence of certain organisms is enough to make decisions on the treatment to administer, with IAQ samples the types of organisms present, their quantities and the visual inspection data of the contaminated place are used to decide whether remediation is necessary and the level of containment required.

The microbiologist understands the laboratory data well and the methods they have applied while the IAQ professional has the field data such as the size of the area colonized, history of the building, occupants health information and other useful data which should be used together in decision making. A two-way communication between the microbiologist and the IAQ professional is therefore critical.

This article is an attempt to provide the kind of information the IAQ professionals and microbiologists should exchange to improve the quality and usefulness of laboratory results.

How the IAQ professionals could help improve laboratory reports

  • Discuss with the laboratory the objectives of the investigation: If the laboratory understands the objectives of the investigation, they may help in deciding the most suitable types of samples to collect for the intended investigation. The laboratory would also know what to report and how to report it. (click this link for information on how to collect and send samples).
  • Provide adequate amount, size and/or number of samples for analysis: The size or amount of sample should be adequate to allow the microbiologist to perform the test and retain some of the material for reference or for retesting in case something goes wrong during the first test or if detailed tests were required after the initial basic test. Where resources allow, the minimum number of samples that can allow statistical analysis of the resulting data should be provided.
  • IAQ Sample Analysis Flow Chart
    Sample Analysis Flow Chart
  • Provide clear instructions on the tests required: If the IAQ consultant has not discussed the objectives of the investigations with the laboratory, they should clearly indicate the tests they require the laboratory to perform and how they desire the results reported or presented. This is particularly important with some types of samples that can be analysed in more than one way (see sample analysis flow chart below).

    For example a swab or a dust sample can be analysed by direct microscopic examination (DME), culturing by direct plating or culturing for quantification (serial dilution). The results for quantification could also be expressed as colony forming units (CFU) per unit area (or per unit weight in case of dust). Each of these analytical methods has its own limitations and gives different data.

    Similarly a bulk sample such as a drywall could also be analysed by culturing or DME. If the laboratory is not directed on what analysis to perform, they may use methods which may not give the results that were expected by the consultant or that may not adequately answer the question being investigated. For instance if the consultant was interested in species present on a bulk sample, DME analysis may not provide this information. The flow chart below shows how various samples could be analysed.

How laboratories could improve the quality of their reports.

  • Give adequate information in the reports: Inadequate information may lead to inappropriate decisions being taken. So, reports generated by the laboratory should include adequate, useful, organized, informative and easy-to-understand information.
  • Provide helpful comments in the reports: Reporting without comments may also lead to inappropriate action. Consider this case: a consultant takes pre-remediation (background) air samples to a laboratory. The samples are highly overloaded with dust particulates and therefore become difficult to analyze. The resulting counts are therefore very low. After remediation, samples are taken again to assess the effectiveness of remediation. This time the samples are not overloaded with dust and counts are significantly higher than the pre-mediation results. If the lab had commented on the first report that the samples were overloaded with dust and that this may result to low counts, the consultant would have decided on whether to take another set of samples or not.
  • Provide information on medical significance of reported moulds: Most laboratories avoid commenting on the medical significance of the moulds or bacteria they identify claiming that they were not qualified to make such comments. While this is true, one of the most important functions that a laboratory should perform is to decide what organisms are of health concern and what constitutes normal flora since this information is already documented in reputable journals or textbooks. By providing this information the laboratory is not in anyway taking the role of medical professionals. If such information is not available the laboratory should indicate so in the reports.
  • Provide a list of references: The laboratories should provide a list of references where the consultant can obtain more information concerning the identified moulds and bacteria and their health significance.

Conclusion

Communication between the IAQ professionals and the laboratories is the key to quality reports.

References

Lee A, McLean S. The laboratory report: a problem in communication between clinician and microbiologist? Med J Aust 1977;2:858-860.


author avatar
Dr Jackson Kung'u
Dr. Jackson Kung’u is a Microbiologist who has specialized in the field of mycology (the study of moulds and yeasts). He is a member of the Mycological Society of America. He graduated from the University of Kent at Canterbury, UK, with a Masters degree in Fungal Technology and a PhD in Microbiology. He has published several research papers in international scientific journals. Jackson has analyzed thousands of mould samples from across Canada. He also regularly teaches a course on how to recognize mould, perform effective sampling and interpret laboratory results. Jackson provides how-to advice on mould and bacteria issues. Get more information about indoor mould and bacteria at www.drjacksonkungu.com.
See Full Bio
social network icon social network icon

No related posts.

Filed Under: Results Interpretation Tagged With: indoor samples, lab report, laboratory analysis report, laboratory reports

How Much Do You Know About Mold?

Take a 3 minutes Quiz and find out how much you know about mold. To start the Quiz please Click START QUIZ below.

General Knowledge Mold Quiz

General knowledge mold quiz- Try it, it's fun!
Complete the form below to see results
Share your result via
Facebook X Pinterest LinkedIn Email

By the way, we have online mold courses at https://www.mytrainingcourses.ca

« Why Are Biocides Not Recommended for Mould Remediation?
How To Interpret Laboratory Results for Airborne Fungal (Mould) Samples »

Online Training

Mold Inspection and Lab results
Interpretation Course. Only $279.50

Mold Testing Kits

FREE Homeowners eBook!

Bacteria Testing

Bacteria Testing lab for bacteria in air, water, soil, dust, and other samples!

Legionella Testing

Legionella Testing by CALA-accredited laboratory. Call Today!

Laboratory Mold Testing

MBL Specializes in Mold Identification and Mold Testing!

Mold Inspection Services

The Mold Testing Company To Call
For Indoor Air Quality Inspection!

Recent Posts

Is E. coli Airborne? Separating Facts from Myths in Bacterial Sampling

In the world of indoor environmental quality, bacterial contamination often raises questions, especially when dealing with sewage damage. A recent … [Read More...]

 - Mold Testing and Bacteria Testing

Is “Black Mold” Equivalent to “Toxic Mold”?

Is "Black Mold" Equivalent to "Toxic Mold"? No, black mold is not equivalent to toxic mold. "Black Mold" is a term that is often used incorrectly to … [Read More...]

 - Mold Testing and Bacteria Testing

Exploring Non-Tuberculous Mycobacteria (NTM): Understanding Characteristics and Implications

What Are Non-tuberculous Mycobacteria (NTM)? Non-tuberculous Mycobacteria are mycobacteria other than Mycobacterium tuberculosis and M. leprae, and … [Read More...]

Learn With Us…

Courses

  • Mold Inspection, Identification and Control
  • Fungal Spore Identification
  • Mold Inspection Business Course
  • How to take Mold Samples Course
  • Coliform Testing
  • WHMIS
  • INTERESTING KNOWLEDGE QUIZES

Get In Touch

By phone or by email
905-290-9101
Email

Our Location
1020 Brevik Place, Unit 1A • Mississauga, ON L4W 4N7
(Phone: 905-290-9101 • toll-free: 1-866-813-0648 • fax: 905-290-0499.)

  • Email
  • Facebook
  • LinkedIn
  • Twitter
  • YouTube

Search this Site

Recent Posts

  • Is E. coli Airborne? Separating Facts from Myths in Bacterial Sampling
  • Is “Black Mold” Equivalent to “Toxic Mold”?
  • Exploring Non-Tuberculous Mycobacteria (NTM): Understanding Characteristics and Implications

Useful Links

  • Chain of Custody Download
  • Contact us
  • Privacy policy

Copyright © 2025 · Mold & Bacteria Consulting Laboratories. Log in