Recreational Diving Medical Screening System

Frequently Asked Questions (FAQs)

Does this medical self-declaration form lapse?

The diver medical form, with or without the physician evaluation, is a status assessment. There is no inherent expiration date, but completion dates are included in both the participant questionnaire and physician evaluation form.

Organizations (or individuals) choosing to use the form can apply their own standards for currency.

For example, an instructional entity may decide that new students should provide forms completed within three months of a program start date. An event organizer may have different requirements. Additional standards can be applied where appropriate.

Why is there no mention of past DCI episodes in the questionnaire?

Many issues related to diving may not be good indicators of future risk.

A history of DCS, for example, could be associated with increased future risk if the diver is cavalier and ignores safety protocols. But it could also be associated with reduced future risk if the diver took an earlier case as a warning and increased conservatism and thoughtfulness.

Complicating the picture further, it is also possible that a diver experienced DCS as part of a controlled study of decompression stress. In this case, the outcome may well have not been related to diver decision-making, and the quick treatment that would be provided as part of the study is not known to increase future susceptibility.

The bottom line is that such a question would have a greater likelihood of being pejorative than truly useful.

The questionnaire was developed to uncover areas of concern with some subtlety, and with thought given to how information might be used and misused.

Does this form factor in the possibility that users may declare false information?

No. The value of the form is dependent upon honest and correct answers. Efforts to hide issues can result in seriously compromised safety. Honest reporting is critical to identify risks, some of which may not be apparent to the person completing the form.

Ultimately, the screening materials are intended to help the community

Whom does the form refer to by "close blood relative"?

Close blood relatives are biological parents, grandparents and siblings.

Why isn't asthma mentioned on the first page of the form?

As a diagnosis, the range of symptom severity and history with this disease varies greatly. Exacerbations and disease control are the principle areas of medical decision making related to fitness to dive evaluations.

Asthma is a topic of interest for diving medical examinations, and our primary focus as physicians is on how well someone is controlled as well as their triggers for exacerbation, not just whether they have asthma or use inhalers. Inhaler use per se is not a stand-alone disqualifier.

The goal of the questionnaire is to find those who have had exacerbations within the last year, as an indication of their overall disease control.

Why is body mass index (BMI) not mentioned in the form?

BMI is not a measure of body composition; it is simply a height-weight ratio. It can be informative, but it can also be misleading. BMI values will be higher for individuals with larger frames and greater muscularity, or lower for those with less muscle and more fat mass. Healthy body composition and general cardiac fitness are important, but these cannot be confirmed with BMI data.

Why does the Medical Guidance not recommend chest X-ray following pneumonia or other relevant lung-related issues?

Imaging, whether standard CXR or CT, may or may not correlate clinically, are frequently not ordered as a standard on everyone in the outpatient environment either to make the diagnosis of pneumonia nor in follow up.

Fit-to-dive determinations related to a history of pneumonia are based on the medical and clinical history and current health status.

Depending on health history or clinical status at the time of evaluation, pulmonary function tests may be performed as well as imaging, but there is no single approach that would appropriately apply to all divers.

The type of imaging study ordered by physicians will depend upon the clinical history and/or examination. In cases where a higher resolution is desired, CT scans are often preferred.

Why is sleep apnea regarded as a relative risk condition to diving?

The cardiovascular system is critical for diving health. As such, heart disease, as well as conditions that are associated with or contribute to it, elevate to the medical concern about diving safety.

Obstructive sleep apnea (OSA) is an independent risk factor for heart disease and is frequently associated with other risk factors or disease processes that either individually or collectively increase an individual’s risk of sudden incapacitation while diving. While not all those with OSA are at definable risk of heart disease or sudden incapacitation, it is worth describing the potential issues associated with OSA from the perspective of a screening questionnaire and diving safety.

The incidence of obstructive sleep apnea is highest amongst obese males, due in part to male pattern fat deposition to the neck and posterior tongue, which increase the risk of airway compromise when lying flat. Associated risk factors for heart disease include obesity, hypertension, elevated cholesterol, and diabetes. Some or all of these conditions are commonly seen either independently or as part of the health history in people with OSA.

Obstructive sleep apnea is not simply about pauses in breathing. Apnea places strain on the right ventricle (the chamber of the heart that pumps blood to the lungs). Over time, this strain increases ventricular muscle size, which elevates the risk of heart failure, as well as rhythm problems (arrhythmias), especially atrial fibrillation. Cardiac arrhythmias may spread to the ventricles, which carry a marked risk of incapacitation. Atrial fibrillation carries additional concerns related to blood clot formation in the heart, pulmonary embolisms, stroke, and reduced exercise tolerance. People with atrial fibrillation are frequently on blood-thinning medications, which is an additional health concern for divers.

I have a medical question. Whom should I contact?

If the questionnaire highlights the need for a medical examination, please bring this material (including the Diving Medical Guidance) to your physician.

If your physician wishes to discuss your case with a specialist in diving medicine, they may contact DAN, free of charge.

Is the Diving Medical Guidance available in other languages?

The Diving Medical Guidance material is currently available only in English. Translation may be possible in the future.