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Pregnancy & Diving
by DAN Medical Team on June 14th, 2016

​I've just found out I'm pregnant. When do I have to stop diving?
​Fitness and Diving Issue

Sifting through the published literature reveals why there is debate over the topic. Data is limited and, in many cases, apparently inconsistent. While this makes drawing conclusions more difficult, it should not be surprising.

Science is very rarely as clear-cut as might be desired. It is difficult to design an ethical experiment that tests only the variable of interest and controls for all others. It is the researcher’s job to design the best experiments possible, and it is the individual’s or advocate’s responsibility to examine the results and decide how to best respond to them.

The question of diving and pregnancy is a difficult one to study since the trend is for women to refrain from diving while pregnant2. Most physicians treat diving as they would any drug for which the evidence with respect to pregnancy is incomplete: If there is not a good reason to take it, avoid it.

Anyone who inadvertently dives while pregnant, however, may take solace in the anecdotal evidence from women reporting repeated diving during pregnancy without complication. There is certainly insufficient evidence to warrant termination of a pregnancy. Moreover, if emergency hyperbaric oxygen is required during pregnancy, for example to treat carbon monoxide poisoning, the evidence suggests that the risk to the fetus with treatment is lower than without.

The overall picture of the literature indicates that, while the effect may be small, diving during pregnancy does increase the risk to the fetus, and the consequences could be devastating to all involved. Appreciating these essential factors, the prudent course is to avoid diving while pregnant. While it is possible that some diving could be completed without impact, the absolute risk of any given exposure cannot be determined from the available data. Given the ethical challenges of research on diving during pregnancy and the fact that diving represents a completely avoidable risk for most women, it is unlikely that studies will be conducted to establish the absolute risk in the foreseeable future.

About the Authors

H E AT H E R H E L D completedan undergraduate degree in biomedical science at Texas A&M University in December 2005. She was placed at the Center for Hyperbaric Medicine and Environmental Physiology, Duke University Medical Center, Durham, N.C., as a DAN research intern in the summer of 2006.

NEAL POLLOCK is a research physiologist at the Center for Hyperbaric Medicine and Environmental Physiology, Duke University Medical Center, Durham, N.C.,


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2 Comments

Daniel - August 7th, 2016 at 12:30 AM
I know a lady who is a diving instructor in Sodwana Bay, South Africa, working for a company who frequently does deep dives and, if I'm not mistaken, even tech diving. She was extremely fit and ran every day and as a result she hadn't had a proper period for years. She fell pregnant and got to almost 6 months into her pregnancy without even knowing she was pregnant. She continued diving as normal every day until she found out.
The baby was born healthy and I believe he's 4 or 5 years old now. He's completely normal and healthy. I always told the father that she should submit the case to some kind of study to contribute to what we know about the topic.
Finding out you've done some dives while pregnant certainly isn't a good enough reason to terminate a pregnancy.
DAN Medical Team - September 5th, 2016 at 3:14 AM
Thank you very much for your comment and contribution to this topic.

This remains a very difficult field of study because of the ethical considerations around pregnant women and their fetus. Although our recommendation, based on medical physiology & science principles and available literature, is to refrain from diving while pregnant, because of the risks to mainly the fetus but also mother, it still remains the individual’s decision. Most people however, will avoid anything that might put their unborn child at risk aside from the distressing effects that could follow.

As the post states “Anyone who inadvertently dives while pregnant, however, may take solace in the anecdotal evidence from women reporting repeated diving during pregnancy without complication. There is certainly insufficient evidence to warrant termination of a pregnancy.” We agree that finding out your pregnant and having done some dives is certainly not a reason to terminate, especially with todays advanced technology available to assess the well-being of the fetus.
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