The reason for taking larger samples on many tests using &quot;normal&quot; methods is not that the instruments are not sensitive but that one needs to draw enough blood to get a representative sample of what&#x27;s actually inside your body. A little prick of blood that comes out is often not such a representative sample. I always wondered how Theranos was going to get around this fact of life. Now as things unfold it increasingly sounds like they can&#x27;t... they just wanted us to think they could.