What offshore medical certificate do you need?

The most common offshore medical certificates are the OGUK medical (formerly UKOOA) and the ENG1 seafarer medical. Which one you need depends on where you work and what type of role you hold. Offshore oil and gas workers typically require an OGUK medical, while seafarers and some offshore personnel need an ENG1. The sections below cover the key differences, validity periods, examination content, and how to get certified.

Which medical certificate is required for offshore work?

Most offshore workers need either an OGUK medical certificate or an ENG1 medical certificate to legally work in their role. The OGUK medical is the standard requirement for oil and gas workers on the UK Continental Shelf and many international offshore projects. The ENG1 is required for seafarers and certain vessel-based offshore roles under maritime regulations.

In practice, the certificate you need is usually determined by your employer, the project operator, or the flag state of the vessel or installation you are working on. Some professionals need both, particularly if their role involves both offshore oil and gas work and time on board vessels. Always check your contract or speak to your employer’s QHSE team to confirm which offshore medical requirements apply to your specific situation.

What’s the difference between an OGUK medical and an ENG1?

The key difference between an OGUK medical and an ENG1 is the regulatory framework each falls under and the type of work they certify you for. The OGUK medical is governed by the Oil and Gas UK guidelines and is designed for personnel working on offshore installations in the oil and gas sector. The ENG1 is a seafarer medical certificate issued under Maritime and Coastguard Agency (MCA) requirements and is required for those working at sea under STCW regulations.

Beyond the regulatory difference, there are also practical distinctions worth knowing:

• OGUK medical: Required for oil and gas offshore workers, assessed against fitness standards specific to the offshore environment, including the ability to evacuate from an installation safely.
• ENG1 medical: Required for seafarers and some offshore marine crew, assessed against MCA fitness standards that focus on the demands of working at sea.
• Scope of acceptance: An OGUK medical is not a substitute for an ENG1, and vice versa. Some operators accept one but not the other, so role-specific guidance is essential.
• Issuing authority: OGUK medicals are conducted by approved medical examiners; ENG1 certificates are issued by MCA-approved doctors.

How long is an offshore medical certificate valid?

An OGUK medical certificate is typically valid for two years for most workers, though this can be reduced to one year for individuals over a certain age or those with specific health conditions. An ENG1 certificate is generally valid for two years, but may be issued for a shorter period depending on the seafarer’s age or medical history.

It is important to renew your offshore health certificate before it expires. An expired certificate can prevent you from travelling to a project, boarding an installation, or passing a pre-mobilisation check. Many professionals choose to renew several weeks before the expiry date to avoid any gap in their certification and to prevent last-minute scheduling pressure.

Who can issue an offshore medical certificate?

An OGUK medical certificate can only be issued by a doctor who is approved under the OGUK medical fitness guidelines. These approved medical examiners are trained to assess fitness specifically for offshore work. An ENG1 certificate must be issued by a doctor who is approved by the Maritime and Coastguard Agency.

Not all general practitioners or occupational health clinics are authorised to issue these certificates. It is essential to book your examination with an approved provider to ensure the certificate will be accepted by your employer or project operator. Booking with a non-approved doctor could mean repeating the examination at your own cost and time.

What does an offshore medical examination include?

An offshore medical examination typically covers a range of physical and clinical assessments to confirm you are fit to work in a demanding and potentially hazardous environment. The exact content varies slightly depending on whether you are undergoing an OGUK or ENG1 assessment, but both follow a structured format.

1. Medical history review: The examiner will review your current and past health conditions, medications, and any previous medical issues relevant to offshore fitness.
2. Vision and hearing tests: Both eyesight and hearing are assessed, as these are critical for safety in the offshore environment.
3. Blood pressure and cardiovascular check: Cardiovascular health is a primary focus given the physical and psychological demands of offshore work.
4. Lung function test: Spirometry or a similar test may be carried out to assess respiratory health.
5. Urine analysis: A urinalysis is typically performed to screen for indicators of underlying conditions.
6. Physical examination: A general physical assessment is conducted to evaluate overall fitness and mobility.
7. Mental health screening: Some assessments include a basic review of psychological fitness and well-being.

The examiner uses the results to determine whether you meet the required fitness standard for your role. If you have a pre-existing condition, it does not automatically disqualify you, but it may result in a shorter certificate validity or additional requirements.

Where can you get an offshore medical certificate near you?

Offshore medical examinations are available through approved occupational health clinics, specialist maritime medical centres, and certain hospital-based occupational health departments. Many of these providers are located near major offshore industry hubs, ports, and airports, making it practical to complete your medical before travelling to a project.

To find an approved provider, check the official OGUK or MCA approved examiner lists, or ask your employer’s QHSE or HR team for a recommended provider in your area. Booking in advance is advisable, particularly during busy mobilisation periods when appointment slots fill quickly. If you are based internationally, our training locations are positioned near key industry hubs to make access as straightforward as possible.

How FMTC Safety supports your offshore certification journey

Getting the right offshore medical certificate is just one part of meeting your full offshore certification requirements. We help professionals and organisations make sure every piece of the compliance picture is in place before mobilisation day.

Here is what we offer to support your offshore readiness:

• Certified OPITO training that complements your medical certificate, including BOSIET, HUET, FOET and other mandatory offshore survival courses.
• Flexible scheduling with guaranteed course dates, even with small groups, so you never face a last-minute cancellation.
• Strategically located training centres near ports, airports, and industry hubs across the Netherlands, the United States, France, Belgium, Saudi Arabia, and beyond.
• Free cancellation or rescheduling up to 24 hours before the course, giving you the flexibility your project timelines demand.
• Support for both individuals and organisations, whether you are a freelance contractor booking for yourself or an HR team coordinating training for a full crew.

If you need to complete your mandatory OPITO offshore courses alongside your medical certification, we make it easy to book, plan, and confirm everything in one place. Contact us to find out which courses apply to your role and get your training scheduled without delay.