In and of itself fairly meaningless; detectable does not mean present at levels high enough to cause health effects (there are a lot of chemicals in our blood, some natural, some not). The "safe" level of BPA exposure is the subject of some fairly contentious debate still - both industry and environmental groups use some really badly designed studies to make their respective cases.
Personally I hate all the reports of chemicals being measured in people's blood without any context, which the environmental groups are particularly guilty of. The Canadian Health Measures Survey was supposed to include some information to put the data in context (how do they compare to other countries, levels at which effects are observed, etc.), but it seems like someone jumped the gun and published the data without the context. The US National Report on Human Exposure to Environmental Chemicals, which is fairly similar, at least includes some background information.
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