Does a C1 licence need a medical?
If you hold or are applying for a C1 entitlement, whether you need a medical depends on how you got that entitlement, your age and the kind of application you are making. For a first Group 2 lorry entitlement, DVLA requires a D4 medical examination report. For C1 entitlement already attached to some car licences, the age and licence-history rules differ. The current DVLA INF4D booklet sets out the exceptions, so check it alongside any forms DVLA sends you.
What does C1 cover?
C1 is a category for certain medium-sized lorries, generally vehicles weighing between 3,500kg and 7,500kg. It can matter if you drive a horsebox, ambulance, motorhome or other vehicle within the category's weight limits. A C1 entitlement may be part of a vocational Group 2 licence, or it may have been granted with an older car licence. Those histories do not always have the same medical requirements.
The rules below describe DVLA's Great Britain application guidance. They explain when a medical report is required, not whether a particular person meets the medical standards. If you are uncertain which category or restriction appears on your licence, check your photocard and entitlement record, then follow the application instructions from DVLA.
When is a D4 medical needed?
The DVLA INF4D booklet says you need a D4 report if you are applying for your first Group 2 lorry or bus licence. It also says a D4 is required when renewing Group 2 entitlement at 45, then every five years until 65 and annually from 65.
That schedule is about the medical report required for an application. It should not be confused with how long your licence lasts or how often you need to make a licence renewal application. A D4 report has a shorter validity window, described below.
There are specific circumstances for C1 entitlement already held through a car licence. The INF4D says that if you are under 70, hold a medically restricted car or motorcycle licence, held it before 1 January 1997, and want to apply for C1 or D1 entitlement, you need a D4. It also says you do not need to send a D4 when renewing a medically restricted licence until you are 45. If you are over 45 with a medically restricted licence, a D4 is required every five years.
The booklet also states that drivers aged 70 who still need C1 and D1 entitlement need a D4 every three years. These details show why it is worth checking your exact entitlement and licence history rather than relying on a general rule for every C1 driver.
Read DVLA's D4 and INF4D guidanceGOV.UKHow age affects licence renewal
For ordinary Group 2 vocational entitlement, DVLA's renewal page describes a different process before age 45 and from age 45 onwards.
If you are under 45, DVLA says it will usually send form D47PU 56 days before the licence runs out. The standard under-45 renewal process does not generally include a D4, unless another circumstance makes one necessary. The page says drivers whose licence expires within 56 days of their 45th birthday should follow the 45-or-over process.
At 45 or over, DVLA says it sends form D47P and a D4 around 56 days before the licence expires. For this age group, the D4 frequency is generally every five years until age 65, then annually. If you are asking, “how often do HGV drivers need a medical?”, this is the general Group 2 schedule, subject to the specific C1 and medically restricted licence exceptions in INF4D.
An age-based renewal medical does not mean every driver will receive the same decision. The doctor records information in the D4 and DVLA considers the application against the relevant standards. If you have a health concern, discuss it with your GP or the relevant healthcare professional.
Check DVLA's lorry and bus renewal guidanceGOV.UKWhy has DVLA sent me a D4 form?
A D4 may arrive because DVLA is inviting you to renew Group 2 entitlement at age 45 or over. It can also be needed for a first Group 2 application, for a new Group 2 provisional entitlement when a D4 has not been submitted in the previous 12 months, or for other circumstances listed in INF4D.
Read the forms and accompanying instructions carefully. The D4 is not simply a general check-up form: it records a medical examination and a vision assessment for the relevant application. The examination includes questions about your health and the eyesight information DVLA needs to consider your entitlement.
Some doctors can complete both the medical and vision sections. If the doctor cannot fully and accurately answer the vision questions, the vision section must be completed by an optician or optometrist. A separate appointment is therefore not always required, but may be needed depending on what the doctor can assess.
How long is a D4 report valid?
A completed D4 is valid for four months from the date it is signed and dated by the doctor and, where relevant, the optician or optometrist. This is the period in which the report can be used for the application. It is separate from the licence period and does not mean a licence is issued for four months.
Try to arrange the examination at a suitable point in your application timetable. If a form is incomplete or the report is no longer valid when you submit it, the application may be delayed or the paperwork may need attention. The INF4D booklet advises checking that all sections have been completed before sending the forms to DVLA.
What if your HGV licence expires during renewal?
An expired licence does not automatically mean you can keep driving while DVLA considers an application. In some situations, you may be able to drive while the application is being processed, but only if you meet the conditions in the current DVLA guidance. These include having held a valid licence, driving only under the conditions of your previous licence, having an application less than a year old, and not having had your last licence revoked or refused for medical reasons. Other exclusions also apply.
The applicable rules can depend on your age and application. In particular, DVLA's under-45 and 45-or-over renewal pages describe different conditions. Read the relevant guidance before driving if your licence has expired or is due to expire. If you are unsure whether the conditions apply to you, contact DVLA for advice.
Read DVLA's guidance on driving while an application is being processedGOV.UKWhat to take to your D4 appointment
Check the INF4D booklet and the instructions for your own application before attending. DVLA's booklet says to take identification documents, your driving glasses and current glasses prescription if you wear glasses to meet the eyesight standard, and a copy of your prescription if a doctor other than your own GP is completing the examination.
Ask the clinic in advance whether the medical professional can complete the vision section. The assessment must use the prescription currently worn for driving. If the doctor cannot complete the vision questions, arrange for an optician or optometrist to do that part.
The medical examination is an opportunity to record your health accurately. Bring relevant information and answer the questions carefully. If you are concerned that a condition or treatment may affect your driving, speak to your GP and check DVLA's medical guidance before your appointment.
C1 medicals and other driver medical requirements
The D4 rules discussed here relate to Group 2 lorry and bus applications and the C1 cases described in the booklet. Taxi licensing is a separate process, with requirements set by the relevant licensing authority. If you are searching for taxi licence medical requirements in the UK, check with your council about its form and standards rather than assuming that the C1 or HGV renewal process applies.
For a C1 or HGV D4 appointment, you can read about the SWDM driver medical service. If you want to understand the process before deciding whether to book, review the service information or contact the clinic with a question.
Our Medical Team
Driver medical appointments
South Wales Driver Medicals offers driver medical appointments for HGV, PCV, LGV and taxi drivers. Contact the clinic for information about the clinician conducting your appointment and the requirements for your form.
Sources and further guidance
DVLA's D4 and INF4D material is the main source for when a report is needed, who may complete the vision section, what to take and how long the report is valid. DVLA's renewal pages explain the application process for drivers under 45 and drivers aged 45 or over. INF188/6 sets out the conditions for driving while an application is being processed.
Sources
- gov.ukMedical examination report for a lorry or bus driving licence (D4), including INF4D notes(accessed 2026-10-05)
- gov.ukRenew or change a lorry or bus licence(accessed 2026-10-05)
- gov.ukRenew or change a lorry or bus licence: if you’re 45 or over(accessed 2026-10-05)
- gov.ukCan I drive while my application is with DVLA? (INF188/6)(accessed 2026-10-05)
This guide is for information only. It is not medical advice. Speak to your GP if you have concerns.
Frequently Asked Questions
- Does a C1 licence need a medical?
- If you are applying for your first Group 2 lorry entitlement, including C1 where it applies, you need a D4 medical report. For C1 entitlement already held with a car licence, the rules depend on your age and licence history. The INF4D says a D4 is needed at 45 and every five years until 65, then annually, with specific exceptions for medically restricted licences and some older C1 entitlements. Check the current DVLA instructions for your circumstances.
- How often do HGV drivers need a medical?
- For Group 2 renewal, a D4 is generally needed at age 45, then every five years until age 65, and annually from 65. The D4 is a medical report used for the application, while the licence itself has its own renewal period. Some licence histories have exceptions, so follow the D4 booklet and the instructions sent by DVLA.
- Why has DVLA sent me a D4 form?
- DVLA normally sends a D4 with renewal forms when a Group 2 driver is 45 or over. You may also need one for a first Group 2 application, a new provisional entitlement in specified circumstances, or other cases listed in the INF4D booklet. The booklet explains when a D4 is required.
- What happens when your HGV licence expires?
- If your licence expires while DVLA processes a renewal, you may be able to continue driving only if you meet the applicable conditions. These include having held a valid licence, driving within its previous conditions, and not having had it revoked or refused for medical reasons. Check DVLA's current guidance before driving; do not assume an application automatically extends your entitlement.
- Do I need a separate optician appointment for the D4 vision section?
- Not always. Some doctors can complete both the medical and vision sections. If your doctor cannot fully and accurately complete the vision assessment, you must arrange for an optician or optometrist to complete it.
- Does a D4 medical last for the whole licence period?
- No. The INF4D says the completed D4 report is valid for four months from the date it is signed and dated by the doctor and, where applicable, the optician or optometrist. That report validity is separate from the duration of your driving licence.