By Cindy Faber, Occupational Health Advisor
Studies show that approximately 14% of the 3.5 million U.S. truck drivers are living with diabetes—about 50% higher than the general adult population. Given the safety-sensitive nature of commercial driving, proper medical evaluation and ongoing management are critical.
Under FMCSA regulation 49 CFR §391.41, a driver is not physically qualified to operate a commercial motor vehicle if they have insulin-treated diabetes—unless they meet the requirements outlined in §391.46.
The September 19, 2018 FMCSA final rule (§391.46) modernized this standard. It allows Certified Medical Examiners (CMEs), in collaboration with the driver’s treating clinician, to determine whether an insulin-treated individual can be certified. This rule replaced the previous federal exemption program, streamlining the process for drivers and employers.
Key Requirements for Certification:
- Drivers treated with insulin must provide the Insulin-Treated Diabetes Mellitus Assessment Form (MCSA-5870)
- The form must be completed, signed, and dated by the treating clinician within 45 days of the DOT physical exam
- The CME uses this information, along with the exam, to determine certification eligibility
What to Expect During the DOT Physical:
- A urine sample will be collected to assess glucose levels
- Drivers with diabetes or pre-diabetes should bring their most recent Hemoglobin A1C (HbA1c) results
- Many examiners look for A1C levels between 7–10% as an indicator of controlled diabetes
Managing diabetes effectively is essential—not only for compliance, but for long-term health and safety on the road. For practical support, the American Diabetes Association offers a digital recipe hub with hundreds of diabetes-friendly meal options, searchable by cuisine and dietary preferences.
👉 Learn more: https://diabetes.org/food-nutrition
How WorkforceQA Supports Employers & Drivers
Managing diabetes in a safety-sensitive workforce requires the right balance of compliance, medical oversight, and operational efficiency. WorkforceQA provides end-to-end support to help employers stay compliant while supporting driver health and safety.
Our DOT Physical & Compliance Services Include:
- Nationwide DOT Physical Network with certified medical examiners
- Expert Guidance on FMCSA Regulations, including insulin-treated diabetes requirements (§391.46)
- Streamlined Documentation Management, including MCSA-5870 compliance support
- Integrated Drug & Alcohol Testing Programs aligned with DOT requirements
- Background Screening Solutions for a fully compliant workforce
We work closely with employers and drivers to ensure all medical certification requirements are met efficiently – reducing risk, avoiding downtime, and keeping drivers safely on the road.
Trusted. Compliant. Always.
