Want to know whether your BMI could affect your medical examination?
Contact OmniHealth for a professional assessment and personalized advice.
bmi in seafarer medical examination
Why BMI matters in maritime medical examinations
BMI in seafarer medical examination is an important indicator of health and safety at sea. This article explains why BMI is measured and when it affects medical fitness.
In the maritime and offshore sector, medical fitness is essential for safety on board. One of the factors routinely measured is the Body Mass Index (BMI). But why exactly? And does a high BMI automatically lead to disqualification? Read further to understand the role of BMI in maritime medical examinations, when it may or may not be a concern, and why an individualised approach is becoming increasingly important.
When BMI in seafarer medical examination becomes a concern
BMI as a tool to asses risk
BMI is a simple calculation based on height and weight. It provides a general estimate of body fat and is widely used as a screening tool worldwide. In medical examinations for seafarers and inland navigation workers, BMI helps assess the risk of health problems such as cardiovascular disease, type 2 diabetes, sleep apnoea, and reduced mobility.
These risks are not only medically relevant but also operationally important: someone who cannot quickly escape, climb, or participate in emergency actions on board may pose a safety risk to themselves and others.
MEDICAL REQUIREMENTS
When is BMI in seafarer medical examination a problem?
A BMI over 40 is considered morbid obesity. According to CESNI guidelines (for inland navigation) and IMO/ILO standards (for seafaring), this can lead to disqualification. For comparison: a person who is 1.78 metres tall has an optimal medical weight of 75 kilograms (BMI 24). At 130 kilograms, the BMI rises to 41 — far above the threshold and therefore a clear medical risk under the applicable guidelines. However, recent clarification from the Medical Advisor for Shipping indicates that this is not an absolute criterion. Disqualification based solely on BMI is considered too narrow an approach. The overall physical condition, any underlying conditions, and the individual’s actual ability to perform their duties on board must always be taken into account.
Everyone working at sea must be able to bring themselves to safety in an emergency — for example, escaping through narrow passages, using life-saving equipment, or abandoning ship. Therefore, with a high BMI, it is important to assess whether a person is physically capable of performing these tasks independently, regardless of their role. If there are doubts, additional testing may be required.
Individual assessment is key
Both CESNI and the IMO/ILO emphasise that medical criteria serve as guidelines, not as rigid rules. The final assessment rests with the examining doctor. This means that people with a high BMI can sometimes still be declared fit for duty, possibly with restrictions. In cases of uncertainty, additional testing may be necessary, such as an exercise test or a report from a specialist. The examining doctor may support their decision with observations of physical capacity and practical performance.
There are known examples of candidates with a BMI of 42 who were still declared fit for duty because they demonstrated adequate mobility and physical resilience, without any accompanying conditions.
Prevention and lifestyle on board
Studies show that more than half of seafarers are overweight. Life on board — with calorie-dense food, limited exercise, and irregular shifts — contributes to this. Obesity is therefore not only an individual issue but a structural challenge within the maritime sector.
For this reason, organisations such as the International Transport Workers’ Federation (ITF), the global union for seafarers, advocate for more attention to healthy living on board. Healthy eating, regular physical activity, and medical guidance are essential to reduce disqualifications and improve safety.
Individual assessment makes the difference
BMI plays a role in every medical examination but is never the only factor. The broader context, the physical demands of the job, and any existing health conditions are equally important. By applying an individualised approach and using additional tests where necessary, unnecessary disqualifications can be avoided — while keeping safety as the top priority.
Written by Sven Daam, ILT-, OEUK- and ElementNL-certified medical examiner specialising in maritime and offshore health assessments.
Other medical examinations
Safeguarding fitness for work
In addition to this medical, OmniHealth also offers a range of other medical examinations
OmniHealth: Your Trusted Partner in Protecting Your Health and Safety
Monday – Friday: 09.00 – 17.00
OmniHealth provides high-quality medical care and services focused on the maritime and offshore industries. With expert examinations, consultations and necessary vaccinations, we are here for you!
Contact
Schipluidenlaan 122,
1062 HE, Amsterdam
Fast forward to