Wow I just saw this - sorry for the late reply! - but I'm working on creating a general blood sensor right now. In the past I've created an accelerometer-based device for tracking head injuries, but it turned out to not be so useful. I'm done a lot of health and fitness tracking, including using an portable ultrasound bodyfat analyzer (I didn't make it myself). But the most interesting thing I'm working on is the blood sensor, you can read about it here: https://github.com/nebulabio/protochip/wiki
I'm certainly interested in DIY QS stuff too. Are there any other communities I should join for this, or is this the best one around? This forum is great but it seems a bit sparse sometimes.
Unfortunately I was only in Berkeley for a short while. I had to move back to Rochester NY to make money, but I'm still looking for jobs in the Bay Area. When I move back out there, I will certainly join one of your meetups!