Every professional HGV driver must hold a valid Group 2 medical certificate to drive commercially. Unlike the standard car driving licence medical requirement (which only applies when you first obtain your licence), Group 2 medical standards apply throughout your career and become progressively more frequent as you age. Understanding the renewal schedule, what the medical involves, and what conditions can affect your licence is essential for every driver over 45.
Group 2 Medical Standards: An Overview
The DVLA applies Group 2 medical standards to all drivers of vehicles over 3.5 tonnes GVW (Category C and above) and all passenger-carrying vehicles (Category D). Group 2 standards are significantly stricter than the Group 1 standards that apply to ordinary car drivers, reflecting the greater risk posed by large vehicles in the event of a medical episode at the wheel.
Group 2 standards cover vision, cardiovascular health, neurological conditions, diabetes, sleep disorders, mental health, and a range of other conditions. The DVLA publishes detailed guidance in its "Assessing Fitness to Drive" document (commonly known as the "At a Glance" guide), which is updated regularly and is available on gov.uk.
Medical Renewal Schedule by Age
The frequency of Group 2 medical renewals increases with age, reflecting the higher prevalence of health conditions in older drivers:
| Age Range | Medical Renewal Frequency | Notes |
|---|---|---|
| Under 45 | At first application only | No routine renewal required until age 45 |
| 45–65 | Every 5 years | D4 medical required at each renewal |
| 65–74 | Annually | Annual D4 medical required from age 65 |
| 75 and over | Annually | Annual D4 medical; DVLA may require specialist reports |
It is important to note that these are the minimum renewal frequencies. If you develop a notifiable medical condition at any age, you are legally required to notify the DVLA immediately, regardless of when your next scheduled renewal falls. Failure to notify the DVLA of a relevant condition is a criminal offence under the Road Traffic Act 1988.
The D4 Medical Examination
The D4 medical is the standard examination used to assess fitness to drive under Group 2 standards. It is conducted by a registered medical practitioner (GP or private doctor) and takes approximately 30–45 minutes. The examination covers:
Vision
Group 2 vision standards are stricter than Group 1. You must be able to read a number plate at 20 metres in good daylight (with glasses or contact lenses if worn). You must also meet the following standards: visual acuity of at least 6/7.5 (0.8) in the better eye and at least 6/60 (0.1) in the worse eye; a binocular visual field of at least 160 degrees horizontally and 70 degrees above and below the horizontal; and no significant diplopia (double vision). If you have had recent eye surgery, you may need a specialist report before the DVLA will renew your licence.
Cardiovascular Health
The doctor will check your blood pressure and heart rate, and ask about any history of heart disease, angina, heart attack, stroke, or TIA (transient ischaemic attack). Group 2 standards for cardiovascular conditions are strict: a first heart attack requires at least six weeks off driving, and return to driving requires a satisfactory exercise tolerance test. Persistent atrial fibrillation (AF) requires specialist assessment. Uncontrolled hypertension (blood pressure above 180/100 mmHg) will result in licence revocation until controlled.
Neurological Conditions
Any history of epilepsy, seizures, blackouts, or loss of consciousness must be declared. Group 2 standards for epilepsy are significantly stricter than Group 1: drivers must be seizure-free for 10 years without anti-epileptic medication to hold a Group 2 licence (compared to one year seizure-free for Group 1). A single unexplained seizure requires at least five years off Group 2 driving. Strokes and TIAs also have strict return-to-driving requirements.
Diabetes
Drivers with insulin-treated diabetes face particular scrutiny under Group 2 standards. Since 2011, insulin-treated drivers can hold a Group 2 licence subject to strict conditions: they must monitor their blood glucose at least twice daily and within two hours before driving; they must not drive if blood glucose is below 5.0 mmol/L; they must carry fast-acting glucose in the cab; and they must have had no severe hypoglycaemic episodes in the preceding 12 months. Tablet-treated diabetes is generally less restrictive, but any history of hypoglycaemia must be declared.
Sleep Disorders
Obstructive sleep apnoea (OSA) is a common condition in HGV drivers, particularly those who are overweight or have a large neck circumference. Untreated moderate-to-severe OSA is a bar to Group 2 driving because of the risk of excessive daytime sleepiness. However, drivers who are receiving effective treatment (typically CPAP therapy) and whose symptoms are well-controlled can continue to drive subject to annual review. If you have been diagnosed with OSA, you must notify the DVLA and provide evidence of treatment compliance.
Mental Health
Conditions such as depression, anxiety, bipolar disorder, and psychosis must be declared if they are likely to affect driving safety. The DVLA assesses each case individually, taking into account the severity of the condition, the treatment being received, and the driver's insight into their condition. Many drivers with well-controlled mental health conditions continue to hold Group 2 licences, but acute episodes or medication changes may require a period off driving.
What Happens at the Medical Appointment
The D4 medical examination is conducted using the official DVLA D4 form, which the doctor completes and signs. The form asks about a wide range of medical conditions and requires the doctor to confirm that you meet the Group 2 standards. The completed D4 form is then submitted to the DVLA with your licence renewal application (D2 form).
The cost of a D4 medical varies between providers: NHS GPs may charge £50–£80, whilst private medical clinics typically charge £80–£120. Some occupational health providers offer D4 medicals at reduced rates for operators with multiple drivers. The cost is not covered by the NHS and must be paid by the driver or their employer.
Renewing Your Licence at 45
The first Group 2 medical renewal falls at age 45. The DVLA will send a reminder letter approximately three months before your licence expiry date. You should book your D4 medical as soon as you receive the reminder, as some GP practices have waiting times of several weeks. The renewal process involves completing a D2 application form, having a D4 medical, and submitting both to the DVLA with your current photocard licence. Processing times are typically four to six weeks.
It is important not to let your licence expire before the renewal is processed. If your licence expires and you continue to drive, you are driving without a valid licence, which is a criminal offence. If you have submitted your renewal application and are waiting for the DVLA to process it, you may continue to drive on the expired licence whilst the application is pending, provided you have a receipt from the DVLA confirming receipt of your application.
Conditions That Require Immediate DVLA Notification
Regardless of your age or renewal schedule, you must notify the DVLA immediately if you develop any of the following conditions:
- Epilepsy or any seizure
- Sudden loss of consciousness or blackout
- Stroke or TIA
- Heart attack or angina
- Diagnosis of diabetes requiring insulin
- Diagnosis of sleep apnoea
- Any condition affecting your vision
- Any condition affecting your limbs or coordination
- Any mental health condition that affects your ability to drive safely
Failure to notify the DVLA of a relevant condition is a criminal offence under Section 94 of the Road Traffic Act 1988, and can result in a fine of up to £1,000. More significantly, if you are involved in an accident whilst driving with an undeclared condition, your insurance may be invalidated.
Planning Ahead for Medical Renewals
The most effective approach to Group 2 medical renewals is to treat them as a routine part of your professional life, just like tachograph calibration or CPC periodic training. Keep a note of your licence expiry date and book your D4 medical at least six weeks before the expiry date to allow time for the DVLA to process your application. If you have any ongoing health conditions, maintain regular contact with your GP and ensure your conditions are well-controlled before your medical appointment.
Related reading: HGV Medical Requirements UK | HGV Eyesight Requirements | HGV Driver Health Requirements | How to Become an HGV Driver UK
