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Fitness to dive and the medical certificate
Nothing holds people up at the dive desk as often as this - and usually not because somebody is unfit to dive, but because the certificate has expired or stayed at home.
When you need a certificate
- When the questionnaire produces a "yes". Heart, lungs, ears, seizures, medication, surgery: each is harmless until pressure is added, which is why a doctor looks at it.
- When the centre or the course requires it, regardless of your answers. Many centres and agencies require one for certain courses or age groups.
- If you dive professionally - separate and stricter rules apply.
In many countries you can dive recreationally without a certificate as long as the questionnaire is clear. That does not make it a bad idea: an examination every few years is the only way to find something you would not notice yourself.
What is examined
A dive medical looks at the organs that pressure affects: ears and sinuses, lungs, heart and circulation. Add a conversation about previous illnesses and medication and, depending on the doctor, an exercise test or a lung function check. Having it done by a doctor with dive medicine experience gives you the more useful assessment - a GP without that background will tend to be either too cautious or too generous.
A certificate is usually valid for one to three years, often shorter for teenagers and for older divers. The exact date is on the certificate - and that date is what counts, not the rule of thumb.
The real mistake: the expiry date
A certificate that expired on the first day of your holiday is as good as none. It happens more often than you would think, because nobody keeps a date three years away in their head. If your certificate is stored digitally, you get a reminder beforehand - Diver ID flags it in good time before your medical or your insurance runs out. That is what an expiry date in a profile is good for and a sheet of paper is not.
When something comes up
A "yes" on the questionnaire does not mean you cannot dive. It means a doctor looks at it and decides. Very many items turn out to be unproblematic once clarified, some come with conditions, a few do not. The centre at the desk neither may nor should make that call - they are not doctors and are not liable for a medical judgement.
What matters is that you answer honestly. The questionnaire is not the hurdle; it is the reason someone underwater has an accurate picture of you.
Frequently asked questions
How long is a dive medical certificate valid?
Usually one to three years, often shorter for teenagers and older divers. The date on the certificate itself is what counts.
Do I need a certificate to dive on holiday?
Not everywhere. In many countries a clear medical questionnaire is enough. You need a certificate as soon as an item is answered with yes, or when the centre requires one regardless.
Who can carry out the examination?
In principle any doctor, but a doctor with dive medicine experience gives you a far more useful assessment.
What if my certificate expires during my holiday?
You will need a fresh assessment locally, which costs days. That is why it pays to store the expiry date digitally and be reminded beforehand.
Set up your dive profile for free
Certifications, medical, insurance and emergency contact in one place - and your next check-in takes seconds. Free for divers, forever, with no app to download.