You're living in Europe, right?
In the USA, a different kind of capitalism rules, and there are quite a few dystopian scenarios that I can come up with, if that kind of monitoring is not strictly regulated by privacy laws.
On a company wide level, the aggregate health level becomes another key performance indicator. Your employed can and will analyze just how sick their workforce can be before productivity drops. Workload can now be increased and work conditions / safety standards lowered until that sweet spot is reached where profit is maximized.
On an individual level, your biodata can not only show if you're sick, it can also calculate the risk of you becoming sick, or maybe even predict it. That is very convenient. If your employer knows you're going go drop out of work in two weeks, the human resources department has enough time to hire a replacement for you, and fire you just in time your absence might cause them a loss in productivity.
On top of that, your health data will likely not be collected by your employer, but by some kind of third party. And not only will they closely cooperate with anyone else with who is interested in putting a score on your health (foremost your insurances), but also future employers. Which will of course mean, that this will primarily hit poor workers, who can't afford the best healthcare.
And I could go on like that. Maybe I should write a novel :)