6 Medical Reasons You Could Fail Your DOT Physical and How to Avoid Them

If you’re a commercial driver, passing your Department of Transportation (DOT) physical is essential for maintaining your Commercial Driver’s License (CDL). This exam ensures you’re medically fit to operate a commercial motor vehicle (CMV) safely. However, certain health conditions can disqualify you from passing the DOT physical. Understanding these conditions and managing them effectively is crucial.

At OccMed Associates, a leading occupational medicine clinic in Lubbock, TX, we specialize in DOT physical services and are here to help you navigate these requirements.

Sleep Apnea

Obstructive Sleep Apnea (OSA) is a condition where breathing repeatedly stops and starts during sleep. Moderate to severe untreated OSA can disqualify you from passing the DOT physical because it increases the risk of daytime sleepiness, which can impair driving performance.

What You Can Do:

  • Get Evaluated: If you exhibit symptoms like loud snoring or excessive daytime sleepiness, consult a sleep specialist.
  • Adhere to Treatment: If diagnosed, using a Continuous Positive Airway Pressure (CPAP) machine as prescribed can help manage the condition.
  • Maintain Compliance: Regularly using your CPAP and documenting compliance can demonstrate control over the condition, allowing you to pass the DOT physical.
  • Improve Respiratory Function: Exercise, especially aerobic activities such as running or cycling, strengthens the lungs and enhances breathing efficiency, which can help keep the airways open during sleep. 

Blood Sugar (Diabetes)

Poorly managed Diabetes or extremely high blood sugar can be a disqualifying factor in a DOT physical. Uncontrolled blood sugar levels can lead to complications like vision problems or neuropathy, affecting driving safety. 

Normal blood sugar after fasting is 99 mg/dL or below. Levels between 100–125 mg/dL suggest prediabetes, and 126 mg/dL or higher may indicate type 2 diabetes. A diagnosis usually requires at least two abnormal test results. The A1C test, which shows your average blood sugar over the past three months, is also used to identify diabetes or prediabetes. According to the 2024 DOT guidelines, your A1C level must be below 10% to pass the physical examination. If your A1C is over 8%, your examiner may request more tests or closer monitoring due to potential health concerns.

What You Can Do:

  • Monitor Blood Sugar: Keep your blood glucose levels within the target range.
  • Regular Check-Ups: Visit your healthcare provider regularly to monitor A1C levels and adjust treatment as necessary.
  • Lifestyle Management: Adopt a healthy diet and regular exercise routine to help control blood sugar levels.
  • Exam Preparation: Ensure you fast properly before your DOT physical to obtain accurate A1C levels.

High Blood Pressure (Hypertension)

High blood pressure is a common issue that can impact your DOT medical certification if not correctly managed. According to DOT guidelines, blood pressure categories for commercial drivers are as follows:

  • Normal: 140/90 mmHg or lower
  • Stage 1 Hypertension: 141–159/91–99 mmHg — drivers may receive a one-year medical certificate.
  • Stage 2 Hypertension: 160–179/100–109 mmHg — may qualify for a three-month certificate, extendable to one year if blood pressure lowers to 140/90 or below.
  • Stage 3 Hypertension: 180/110 mmHg or higher — generally disqualifying for commercial driving.

It’s important to note that these blood pressure limits may vary slightly depending on the state in which the driver is operating. For personalized guidance and to ensure compliance with DOT medical certification requirements, consult with our team or another healthcare professional. 

What You Can Do:

  • Medication Adherence: Take prescribed antihypertensive medications consistently.
  • Lifestyle Changes: Reduce sodium intake, maintain a healthy weight, and engage in regular physical activity.
  • Regular Monitoring: Keep track of your blood pressure readings and consult your healthcare provider for adjustments.

Respiratory Conditions

Chronic respiratory diseases like asthma, chronic obstructive pulmonary disease (COPD), or other conditions requiring oxygen therapy can be disqualifying. These conditions can impair your ability to operate a commercial motor vehicle (CMV) safely and securely.

What You Can Do:

  • Medical Evaluation: Undergo pulmonary function tests to assess the severity of your condition.
  • Treatment Compliance: Follow prescribed treatments and avoid known triggers.
  • Regular Check-Ups: Monitor your condition with your healthcare provider to ensure it’s well-managed.

Hearing and Vision

Adequate hearing and vision are essential for safe driving. The DOT physical requires drivers to have at least 20/40 vision in each eye, with or without correction, and the ability to perceive a forced whisper at a distance of at least five feet. 

What You Can Do:

  • Corrective Measures: Use prescribed glasses, contact lenses, or hearing aids as needed.
  • Regular Exams: Schedule annual eye and hearing exams to monitor any changes in your vision and hearing.
  • Report Changes: Inform your medical examiner of any significant changes in your hearing or vision.

Proteinuria

Proteinuria, the presence of excess protein in urine, can indicate kidney disease. While not an automatic disqualifier, it may lead to further evaluation to determine if it’s safe for you to operate a CMV. 

What You Can Do:

  • Follow-up Testing: If proteinuria is detected, additional tests should be performed to assess kidney function.
  • Manage Underlying Conditions: Control conditions like hypertension or diabetes that can contribute to kidney issues.
  • Consult a Specialist: Work with a nephrologist if necessary to manage your kidney health. 

Stay Road-Ready: Take Charge of Your Health Before Your DOT Physical

Passing your Texas DOT physical is essential for maintaining your CDL and ensuring road safety. By proactively managing these health conditions, you can increase your chances of passing the exam. At OccMed Associates, we specialize in occupational medicine and offer comprehensive DOT physical services tailored to meet your specific needs. Our experienced team is here to help you navigate the requirements and maintain your health for a successful driving career.

If you are due for your DOT physical or have concerns about any of these health conditions, contact OccMed Associates today. We have two convenient locations in Lubbock, TX, and offer flexible scheduling to accommodate your needs. Call us at 806-795-7433 (East) or 806-780-7433 (West) to schedule your appointment.