The weird thing about Theranos is that every single expert who knew about the technical details of blood testing basically called out the BS from the get go.

Blood testing for a single condition can involve blood separation via centrifuges, application of various chemical solutions, a multi-step process using varios test strips (each with different specificities/sensitivities). Not to mention some of the offending markers might be so rare in blood that you'd have to draw multiple vials just to get a statistically significant amount of markers.

Reducing just a single one of these tests to an instant test that works with a drop of blood would be a major breakthrough, subject to various medical awards (and lengthy medical trials).