The main (claimed) innovation of Theranos was not just about the location of the blood draw, it's about quantity. If you could really replace 10's of mls blood

The main (claimed) innovation of Theranos was not just about the location of the blood draw, it's about quantity. If you could really replace 10's of mls blood draws from the arm with a few drops (< 1 ml) drawn from the fingertip with no loss of clinically usable information, it would actually be a major breakthrough. There are distressingly large number of patients in hospitals requiring once a day (or even more frequent) blood draws to maintain correct treatment. The volume of blood and availability of veins and pain threshold can become actual, serious problems very quickly. This is doubly true in children. If such tests were somehow found, they'll be noble-prize worthy scientific breakthroughs. Somehow Theranos is not giving off that vibe sadly.