The problem with Theranos isn't microfluidics and labs-on-a-chip, since lots of other people manage to use that successfully. Rather, the problem with Theranos

The problem with Theranos isn't microfluidics and labs-on-a-chip, since lots of other people manage to use that successfully. Rather, the problem with Theranos is that a small amount of blood from an extremity surface won't necessarily be representative and is easy to contaminate, so you can't get reliable data from it.