It is a piece of information that contributes to the knowledge in deciding whether you have a problem in the first place, or whether the problem you're trying to resolve has successful approaches for doing so. But biomonitoring is only a piece of the puzzle. We don't necessarily get from biomonitoring what it was that led to the exposure that put the material into the person you've measured. Is it because of an industrial release? Is it through the food system?
So it's only part of the picture in terms of deciding what you have to fix—if you have something to fix—and how you're fixing it.