Common Mistakes When Using Fit Testing Supplies and How to Avoid Them
July 7, 2026 · 5 min read
By Jeff Schroeder — DOT-qualified Breath Alcohol Technician trainer (49 CFR §40.213) and calibration technician, Foster Special Instruments.
Fit testing supplies are essential for ensuring safety in environments where respiratory protection is necessary. However, many individuals and organizations make common mistakes that can compromise the effectiveness of these supplies. In this blog, we’ll explore the pitfalls to avoid when using fit testing supplies and share helpful tips to make your fit testing process a success.

Neglecting Proper Training for Fit Testing
One of the most significant mistakes people make is skipping training. It’s essential to understand the equipment and testing methods to conduct fit testing effectively. Without proper training, users might improperly set up equipment, leading to inaccurate outcomes. This oversight can ultimately compromise safety—an unthinkable oversight in any environment relying on effective respiratory protection.
Moreover, training empowers individuals to identify potential errors and correct them in real-time. Hands-on training sessions allow participants to familiarize themselves with fit testing supplies and develop a comfort-level that is critical when conducting actual tests. Consider layering training with regular refreshers to ensure everyone involved stays up to date.
An excellent strategy is to establish a culture of continuous learning around fit testing. Encourage questions and discussions about best practices to create a collaborative environment. When the team collectively strives for knowledge, it enhances overall competency and strengthens safety protocols.
Using Expired or Improperly Stored Supplies
Fit testing supplies can have expiration dates that, when ignored, may lead to inaccurate results. Many assume that a slight overlap with expiration is acceptable; however, it’s critical to remember that the effectiveness of materials can deteriorate over time. An expired supply could skew test results, inferring safety where there is none—this is especially alarming when the stakes involve health and safety.
Proper storage conditions also play a crucial role in maintaining their integrity. For instance, excessive heat or humidity can render supplies unusable. Always keep fit testing kits in a controlled environment, away from direct sunlight and extreme temperatures. Encourage routine checks on supplies to prevent complacency.
In terms of inventory management, it’s prudent to adopt a first-in, first-out (FIFO) system. This simple practice can significantly minimize the chances of using outdated supplies. Regular audits of inventory not only ensure the use of current supplies, but they can also help identify trends in usage, allowing for better planning and procurement.
Forgetting to Conduct a Pre-Test Check
Before starting the test, it’s important to inspect all equipment. This ensures everything works correctly and identifies potential issues before they impact the results. A simple pre-test checklist can be a lifesaver. Make it habitual to run through this list to verify that air flow rates are correct, masks are undamaged, and that all supplies are intact before the test begins.
Forgetting this step may seem harmless, but it can lead to disastrous consequences, like failing to identify a leak in the respirator that compromises the entire purpose of the fit test. Additionally, ensuring equipment functionality can enhance tester confidence, which in turn can positively influence the testers’ performance.
Involving the entire team in the pre-test check not only builds accountability but reinforces an understanding of the critical elements that contribute to an effective testing experience. This collaborative effort cultivates a shared responsibility for the safety and health of every team member.
Overlooking Environmental Factors
The environment in which fit testing takes place can directly affect the outcomes. Factors such as airflow, humidity, and temperature should be monitored to ensure accurate results. Even seemingly trivial details can introduce variability into the tests that may skew the results dramatically.
For instance, a drafty room can significantly impact the fit of a respirator, as air leakage can give false confidence in protection levels. Creating a standardized testing environment helps maintain consistency across all tests, allowing for accurate comparisons and assessments over time.
Moreover, document any environmental conditions at the time of testing, along with the results. This record can help identify patterns related to environmental influences and inform strategies for creating optimal testing conditions in the future.
Failing to Use the Right Testing Method
Different types of respirators require specific fit testing methods. Not using the appropriate method for the respirator type can lead to misleading results. For example, qualitative fit testing is great for certain masks, while quantitative methods are preferable for others. Choosing the wrong method can be like using a hammer to drive a screw; it just won’t yield the right outcome.
It’s essential to stay informed about the latest guidelines concerning fit testing methods, as regulations can vary based on the situation and equipment being used. Regular training opportunities, seminars, and updated reference materials can provide useful insights on this topic.
As a best practice, always re-evaluate the fit testing protocols before conducting a fit test. Share knowledge among the team members involved, as this not only supports compliance but boosts collective awareness about the importance of methodical testing.
Ignoring the Importance of a Fit Test Record
Keeping a well-documented record of fit tests helps track compliance and performance over time, making it easier to identify trends and issues that may arise. Unfortunately, this can often be overlooked, leading to gaps in knowledge and the potential for repeated mistakes.
A comprehensive record system allows easy reference when new employees join, or when audits are performed. Individuals can trace back to see which methods have been effective in the past and which haven’t, improving the entire fit testing process.
In practicing transparency, regular reviews of these records during meetings can foster open discussions about potential discrepancies or areas needing improvement. This encourages an environment where team members feel empowered to identify issues without fear of retribution; after all, safety is best achieved through collaboration.
Wrapping Up: Improving Your Fit Testing Practices
By recognizing and avoiding these common mistakes, you can ensure that your fit testing process is as effective as possible. Proper use of fit testing supplies not only enhances your safety but also contributes to a compliant and efficient workplace. Remember, a little preparation goes a long way in achieving a successful fit test!
EasyOne and Benson spirometers, genuine flowtubes, filters, and calibration syringes — shipped nationwide, with calibration and service from the same team.
Shop spirometry equipment & suppliesRelated guides
Spirometer Calibration: Syringe Checks & ATS/ERS Accuracy
How spirometer calibration syringe checks work, how often they're needed, and what accuracy tolerance ATS/ERS standards require.
4 min read Read →Spirometry & Fit TestingRespirator Fit Testing: Qualitative vs Quantitative Methods
The difference between qualitative and quantitative respirator fit testing under 29 CFR 1910.134 Appendix A, and which method applies when.
5 min read Read →Spirometry & Fit TestingOccupational Spirometry: Keeping Your PFT Results Defensible
Calibration verification, technician training, single-use consumables, and test quality — the practices that make workplace spirometry stand up to scrutiny.
5 min read Read →