A D4 medical is an essential health check for anyone applying for, or renewing, a licence to drive a lorry, bus, or large commercial vehicle. Although the form can look intimidating at first glance, the process is actually very straightforward. At SimplyMedicals, we complete D4 medicals every day — so here is a clear explanation of what the requirements actually mean.
What Is a D4 Medical?
A D4 medical is a health assessment required by the DVLA to ensure that professional drivers are medically fit to drive safely. It applies to people applying for or renewing:
- Group 2 licences (e.g., HGV, LGV, PCV)
- Bus and coach licences
- C1 licences (including for ambulance work)
- Drivers over 45 renewing their licence
It must be completed by a doctor registered with the GMC, or by an optician for the vision section.
The aim isn’t to disqualify drivers — far from it. The DVLA simply wants to ensure that any health issues that might affect driving are properly managed.
What Tests Are Included in a D4 Medical?
The assessment includes several simple checks, none of which are painful or complicated:
1. Vision Test
You’ll be asked to read an eye chart. If you wear glasses or contact lenses, bring them with you. Your optician can fill out this section too.
2. Blood Pressure
High blood pressure is one of the most common reasons a medical needs repeating. Good preparation helps — avoid caffeine and smoking beforehand.
3. Medical History Review
The doctor will ask about:
- Heart conditions
- Diabetes
- Neurological disorders
- Mental health
- Sleep disorders (e.g., sleep apnoea)
- Medications
Be honest — in most cases, conditions are manageable and do not prevent obtaining a licence.
4. Physical Examination
This includes:
- Height and weight
- Urine test (usually for diabetes indicators)
- Basic heart and lung check
- General health assessment
How to Prepare and What to Bring
To make the process smooth, bring:
- Photo ID
- Your current prescription/glasses
- Any hospital letters
- A list of medications
- Your driving licence number
Eating lightly and staying hydrated can help with blood pressure readings.
At SimplyMedicals, appointments typically take 15–20 minutes, and we guide you through every part of the form. Most drivers pass with no problems at all — and we are here to help if anything needs follow-up.
A D4 medical may look complicated on paper, but in reality, it’s a simple check designed to keep you — and everyone on the road — safe.
Ultimately, It all starts with your D4 medical Examinations.
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