D4 Medical Form: What It Is, What to Expect, and How to Book

If you drive an HGV, bus or coach for a living — or you’re applying for a Group 2 licence for the first time — the D4 medical form is something you’ll need to get right. It’s a DVLA requirement, not a formality, and it needs to be completed by a doctor who can assess you properly and provide a valid signature and stamp. This page explains exactly what the form involves, who needs one and how to get it done in Bristol without unnecessary delay.

What is the D4 medical form?

The D4 is the DVLA’s official medical examination report form for Group 2 licence holders. Group 2 covers lorries (category C), buses and coaches (category D), and their subcategories — essentially any commercial vehicle above 3.5 tonnes, and any vehicle licensed to carry more than eight passengers for hire or reward.

The form itself is divided into sections covering your personal details, your medical history as declared by you, and the clinical findings recorded by the examining doctor. Once the examination is complete, the doctor signs and stamps the form and you send it to the DVLA as part of your licence application or renewal.

It is worth being clear on one point: the D4 is not a pass/fail document in the way a driving test is. It is a medical assessment that informs the DVLA’s licensing decision. The doctor completes and certifies the findings; the DVLA makes the final decision on your licence.

You can find out more about the full range of DVLA medicals we offer at our DVLA Medicals service page.

Who needs a D4 medical?

The rules vary depending on whether you are applying for a licence for the first time or renewing an existing one.

First-time Group 2 applicants

If you are applying for a category C or category D licence for the first time, you will need a D4 medical regardless of your age. There is no minimum age threshold — the requirement applies from the outset.

Renewals and age-related requirements

Group 2 licences are issued for shorter periods than ordinary car licences, and the medical requirements become more frequent as you get older:

• From age 45, your Group 2 licence must be renewed every five years, and a D4 medical examination is required at each renewal.
• From age 65, renewal is required annually, which means a D4 medical every year.
• Before age 45, you may not be required to submit a D4 at renewal unless the DVLA has reason to request one — for example, if you have a declared medical condition that requires monitoring.

If the DVLA writes to you asking for a medical examination at any point — regardless of your age — a D4 will usually be the form they require.

Existing conditions and licence conditions

Some drivers are required to undergo more frequent medicals as a condition of their licence. If you have a condition such as insulin-treated diabetes, sleep apnoea, a cardiovascular history or a neurological condition, your licence may already carry a review date that triggers a D4 requirement earlier than the standard schedule.

What does a D4 medical examination include?

The D4 examination follows a structured format set by the DVLA. It is more thorough than a standard GP appointment, and takes around 30 minutes to complete. Here is what the examining doctor will assess:

Vision

Visual acuity is tested with and without glasses or contact lenses if worn. Group 2 standards are stricter than for ordinary car drivers. You need to read a number plate at 20 metres, and meet specific acuity thresholds — at least 6/7.5 in the better eye and at least 6/60 in the worse eye, with or without correction. Visual field assessment is also required. If you wear glasses or lenses, bring them to the appointment.

Blood pressure

Blood pressure is measured during the examination. The DVLA has specific thresholds above which a licence cannot be certified. Persistently raised blood pressure — particularly above 180 systolic or 100 diastolic — is likely to result in a referral rather than immediate sign-off.

Urine testing

A urine dipstick test is carried out to check for glucose and protein. A positive glucose result may prompt further investigation for diabetes before the examination can be certified.

BMI

Height and weight are recorded and BMI calculated. Very high BMI is not automatically disqualifying, but it may raise questions about associated conditions such as sleep apnoea or cardiovascular risk that require further discussion or investigation.

Cardiovascular assessment

The doctor will take a detailed history of any cardiovascular symptoms or diagnoses — chest pain, palpitations, previous heart attack, arrhythmia, peripheral vascular disease. A resting ECG is not routinely required by the D4 form, but may be indicated depending on your history. If you have a pacemaker or have had cardiac surgery, the DVLA will want detailed information about your current cardiac status.

Neurological assessment

Any history of seizures, blackouts, stroke or TIA, head injury or neurological diagnosis will be explored. The DVLA has specific seizure-free periods before a Group 2 licence can be granted — generally longer than those for Group 1 licences. If you have had a TIA or stroke, the timeline and nature of your recovery will affect eligibility.

Ear, nose and throat

Hearing is assessed informally, and any significant ENT history is recorded.

General health and medication review

The doctor will review your medical history, any current medications and any conditions not already covered above. Certain medications — particularly those with sedating effects or those that affect alertness — may be relevant to the DVLA’s assessment.

Mental health

Any history of psychiatric illness, including depression, anxiety disorders or psychosis, will be documented. The D4 does not automatically exclude people with a mental health history, but significant or recent episodes may prompt the DVLA to seek further information.

How to get a D4 medical in Bristol

At The Lagom Clinic, we provide D4 medical examinations at our Redland clinic — 4 Redland Court Road, Bristol BS6 7EE. The examination is carried out by Dr Jack Ogden, a GMC-registered GP with experience in DVLA medical assessments.

The process is straightforward:

1. Download the D4 form. The form is available to download from the DVLA website. Print it out and complete the personal details and medical history sections before your appointment — this saves time and ensures accuracy.
2. Book your appointment. Same-week appointments are often available. You can book directly via our DVLA Medicals page.
3. Attend the clinic. Bring your completed D4 form, your glasses or contact lenses if you wear them, and any relevant medical records or letters if you have a significant medical history. Allow around 30 minutes for the examination.
4. Examination and sign-off. Dr Jack Ogden will complete the clinical sections of the form, add his GMC registration number, signature and clinic stamp.
5. Send to the DVLA. You take the completed form away and submit it to the DVLA yourself, along with your licence application or renewal. The DVLA’s address for medical forms is printed on the D4 form itself.

We do not forward the form to the DVLA on your behalf — this is standard practice for D4 examinations and keeps you in control of your application timeline.

How much does a D4 medical cost?

At The Lagom Clinic, the D4 medical examination is priced from £125. This includes the full examination, Dr Jack Ogden’s signature and the clinic stamp required by the DVLA. There are no additional charges for the GP letter or the stamp.

The DVLA does not cover the cost of D4 medicals for most drivers. Some employers — particularly haulage companies and transport operators — will reimburse the cost, so it is worth checking your employment contract or speaking to your employer before booking.

How long does a D4 medical take, and how long is the form valid?

The appointment itself takes around 30 minutes. You will leave with your completed form on the day.

Once completed, the D4 form is valid for four months. This means you need to submit it to the DVLA within four months of the examination date. If your licence renewal has a deadline, work backwards from that date to ensure you leave enough time for the DVLA to process your application.

DVLA processing times can vary — typically between two and six weeks — so do not leave the medical to the last moment if your current licence has an expiry date approaching.

Common reasons for D4 referral or delay

Most drivers complete their D4 examination and receive a signed form on the day. However, there are situations where the doctor cannot complete the sign-off immediately:

• Blood pressure above the DVLA threshold. If your blood pressure is significantly elevated on the day, the doctor may ask you to attend for a repeat reading before certifying the form. Anxiety can raise blood pressure temporarily, so this does not necessarily mean a long delay.
• Glucose in urine. A positive urine dipstick for glucose may indicate undiagnosed or poorly controlled diabetes, which would need further investigation before the DVLA medical can be certified.
• Undisclosed or complex medical history. If you arrive with a significant medical history that has not been assessed under DVLA standards before — such as a recent cardiac event or a history of seizures — the doctor may need to obtain records or write to the DVLA before completing the form.
• Vision below the required standard. If your corrected visual acuity does not meet the Group 2 threshold, the form cannot be certified. An updated prescription or a referral to an ophthalmologist may be required.
• Medication concerns. Some medications are incompatible with Group 2 driving under DVLA guidelines. If you are taking a medication that affects alertness or has specific DVLA restrictions, this will need to be discussed.

If there is any uncertainty about your eligibility before booking, you are welcome to contact the clinic in advance. It is better to know before the appointment than to arrive and find that additional steps are needed.

D4 medical form — frequently asked questions

Can my NHS GP complete the D4 form?

Your NHS GP is not obliged to carry out a D4 medical and many practices do not offer this service. Those that do may have long waiting times or may charge a fee comparable to private clinics. If your GP does offer DVLA medicals, they are a reasonable option — but if they do not, or if you need an appointment quickly, a private clinic such as ours is a straightforward alternative.

What happens if the DVLA does not grant my licence after a D4 medical?

A completed D4 form does not guarantee that the DVLA will grant your licence. The DVLA makes its own assessment based on the doctor’s findings and its medical standards. If your licence is refused or revoked on medical grounds, the DVLA will write to explain the reasons. You have the right to ask for a review and, in some circumstances, to appeal the decision. The examining doctor cannot reverse or override a DVLA decision, but they can provide supporting information if requested.

How long is a D4 medical form valid for?

The completed D4 form is valid for four months from the date of examination. It must be submitted to the DVLA within that period.

Do I need to fast before a D4 medical?

There is no requirement to fast before a D4 medical. The urine test checks for glucose and protein using a dipstick — it is not a fasting blood glucose test. If you have recently eaten a large sugary meal and are concerned about an incidental glucose reading, you may prefer to book in the morning before eating, but this is not a formal requirement.

Can I drive while my D4 application is being processed by the DVLA?

This depends on your situation. If you are renewing an existing Group 2 licence that has not yet expired, you may generally continue driving in the relevant category while your renewal is processed, provided you have submitted your application and medical form before the licence expired. However, if your licence has already expired or you are applying for a new category for the first time, you should not drive in that licence category until the DVLA grants it. If you are unsure, check with the DVLA directly — they can confirm your status.

Do I need a new D4 medical if I change employer or vehicle type?

Your Group 2 licence is issued to you personally and is not tied to a specific employer or vehicle. Changing jobs or driving a different type of HGV does not automatically require a new D4. A new examination is only required if the DVLA requests one, or when your licence is due for renewal under the standard age-related schedule.