I&#x27;m not a biochemist, and it&#x27;s been too long ago when I worked there to comment on what the current state of the art is in this area.<p>What I recall is that at the microfluidic level, a lot of the work becomes a mechanical issue not a biochemical one.  You&#x27;re working with very small samples in a disposable system (obviously cleaning a capillary between samples is practically impossible).  Blood isn&#x27;t the easiest substance to work with, especially when trying to move it through small channels.<p>On top of that, now you&#x27;re trying to detect very small amounts of antigen in an even tinier sample size.  Your technology needs to be incredibly sensitive but have a decent resolution as well.  Some antigens you want a simple positive&#x2F;negative outcome.  But with some other tests you want a level or range (like thyroid).