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Driving professionally comes with a great responsibility—not only for the driver’s safety but also for passengers, goods, and other road users. This is why medical assessments play a crucial role in ensuring that drivers are fit for the job. One such assessment is the D4 driver medical examination, which is essential for those applying for or renewing a Group 2 (bus, lorry, and heavy goods vehicle) driving license in the UK.
In this article, we will cover everything you need to know about D4 drivers, including who needs the assessment, what it involves, and how to prepare for it.

A D4 Medicals is a health assessment required by the Driver and Vehicle Licensing Agency (DVLA) to ensure that drivers of larger vehicles meet the necessary medical standards. It is a mandatory check for:
HGV (Heavy Goods Vehicle) drivers
PCV (Passenger Carrying Vehicle) drivers
LGV (Large Goods Vehicle) drivers
Taxi and private hire drivers (in some cases)
The purpose of this medical assessment is to ensure that drivers are physically and mentally capable of handling large vehicles safely on the road.
The D4 medical examination is required for the following categories of drivers:
If you are applying for an HGV, PCV, or LGV license for the first time, you must complete a D4 medical examination before your license application is processed.
Professional drivers need to renew their Group 2 license every 5 years once they turn 45. However, after the age of 65, annual medical assessments are required.
If a driver has specific medical conditions such as diabetes, epilepsy, heart disease, or vision impairments, they may be required to undergo additional or more frequent D4 medical assessments.
Some local councils require taxi and private hire drivers to take a D4 medical exam before they can obtain or renew their license.
The D4 medical exam is a thorough check-up conducted by a qualified doctor, often at a clinic that specializes in driver medicals. The test consists of:
The doctor will check your eyesight to ensure you meet the DVLA’s vision standards.
If you wear glasses or contact lenses, bring them to the test.
Your visual acuity (clarity of vision) and peripheral vision will be assessed.
Blood pressure will be measured to rule out hypertension.
Heart health is checked to detect any underlying conditions.
A general examination of your physical and mental fitness.
Checks for neurological disorders like epilepsy or stroke history.
Screening for mental health conditions such as severe depression or anxiety that might affect driving ability.
The doctor will ask about past and present medical conditions, surgeries, and medications.
If you have diabetes, your control of the condition will be assessed.
Any history of drug or alcohol abuse will also be evaluated.
To ensure a smooth medical examination, follow these preparation tips:
Bring required documents: Carry your photo ID, medical history records, and current medications.
Wear your glasses/contact lenses if needed: You’ll need them for the vision test.
Avoid caffeine and smoking before the test: These can elevate blood pressure readings.
Stay hydrated and get enough rest: Being well-rested helps in getting accurate test results.
The D4 driver medical exam typically takes 15 to 30 minutes. However, the actual time may vary depending on your medical history and whether additional tests are needed.

The doctor will fill out the D4 medical report form, which is then submitted to the DVLA.
If you pass the medical, you can proceed with your license application or renewal.
If any health concerns arise during the medical, you may need additional tests before approval.
Conditions such as high blood pressure, poor vision, or diabetes complications may delay the process.
Many private clinics specialize in driver medicals and offer quick appointments at affordable rates.
Some people choose to have the exam done by their regular GP, but this can be more expensive and take longer to schedule.
There are D4 medical centers across the UK that provide fast and efficient services tailored for professional drivers.
The cost of a D4 medical exam varies depending on the provider:
GP Surgery: £80 - £120
Private Clinics: £40 - £70
Specialist Driver Medical Centers: £50 - £90
It’s advisable to compare prices and services before booking an appointment.
If your eyesight doesn’t meet DVLA standards, you may be required to get corrective lenses.
Uncontrolled hypertension can lead to a test failure, so maintaining a healthy lifestyle is important.
Drivers with poorly managed diabetes may need further assessment.
Conditions such as epilepsy or severe mental health issues can affect passing the medical test.
The London D4 Medical is a crucial step in ensuring road safety by assessing the fitness of professional drivers. Whether you’re applying for an HGV, PCV, or LGV license, maintaining good health and being prepared for the test can make the process smoother.
If you’re due for a D4 medical, make sure to schedule your appointment with a certified medical professional and take the necessary steps to ensure a successful assessment.