August 2026

14 guides published this month.

Insufficient Breath on an Alcohol Test: What DOT Procedure Requires

What happens when a driver can't produce enough breath volume for a DOT alcohol test, how the medical evaluation referral works, and how it differs from a refusal.

5 min read Read →Breath Alcohol Testing

EBT vs ASD: Which Alcohol Screening Devices DOT Accepts

DOT alcohol testing only allows devices on NHTSA's Conforming Products List. Here's how EBTs and ASDs differ, which one your program actually needs, and how to verify a device is approved.

5 min read Read →Breath Alcohol Testing

DOT Alcohol Test Refusals: What Counts and What Happens Next

What legally counts as a DOT alcohol test refusal under 49 CFR Part 40, how it differs from a violation, and the immediate consequences for the employee.

5 min read Read →Breath Alcohol Testing

Post-Accident Alcohol Testing: The 8-Hour Clock Under 49 CFR 40

DOT post-accident alcohol testing has an 8-hour deadline, not a 2-hour one — and that deadline behaves differently than most safety managers assume. Here's the actual rule.

5 min read Read →Breath Alcohol Testing

DOT Random Alcohol Testing Rates: How Selection Pools Work

DOT random alcohol testing runs on an annual percentage rate, not a per-employee schedule. Here's how the selection pool, rate changes, and refusal consequences actually work.

6 min read Read →Spirometry & Fit Testing

Fit Test Recordkeeping: What 1910.134 Requires You to Retain

What OSHA's respiratory protection standard requires fit test records to contain, how long to keep them, and the documentation mistakes that surface during an inspection.

6 min read Read →Spirometry & Fit Testing

PFT Results Explained: A Safety Manager's Guide to FVC, FEV1, and Ratios

How to read pulmonary function test results without a medical degree — what FVC, FEV1, and the FEV1/FVC ratio actually tell you about an employee's lung function.

6 min read Read →Spirometry & Fit Testing

Spirometer Hygiene: Preventing Cross-Contamination Between Tests

Single-use filters, sensor cleaning, and disinfection protocols that keep occupational spirometry safe from one employee to the next.

5 min read Read →Spirometry & Fit Testing

N95 Fit Testing for Healthcare: Qualitative Protocols That Scale

How healthcare facilities run qualitative N95 fit testing across large staff rosters without violating 1910.134 or blowing up the testing budget.

6 min read Read →Spirometry & Fit Testing

Annual Fit Test Requirements: What Triggers a Retest Early

OSHA requires a fit test at least annually, but five specific conditions require an earlier retest. Here's what triggers one and how to build them into your program.

5 min read Read →Spirometry & Fit Testing

Respirator Medical Evaluation: 1910.134 Appendix C Questionnaire Explained

OSHA requires a medical evaluation before any employee wears a respirator. What Appendix C covers, who reviews it, and how the process ties into fit testing.

5 min read Read →Spirometry & Fit Testing

Acceptable and Repeatable Spirometry Curves: ATS 2019 Criteria

How ATS/ERS 2019 grades spirometry acceptability and repeatability — start-of-test criteria, back-extrapolation, and what an A vs. D grade means.

5 min read Read →Spirometry & Fit Testing

NIOSH Spirometry Training: Does Your Technician Need It?

NIOSH-approved spirometry training explained: who needs it, what it covers, how long it lasts, and what happens if your program skips it.

5 min read Read →Spirometry & Fit Testing

Spirometry in Silica-Exposed Workplaces: 1910.1053 Medical Surveillance

OSHA's respirable crystalline silica standard requires periodic spirometry for exposed workers. What triggers testing, what's measured, and how the surveillance schedule works.

6 min read Read →