One drop of blood: didn't Theranos make this claim?

that Theranos' technology could use a drop of blood to instantly test for a host of medical conditions.
.... a modernized blood test, advertising a cheap finger prick that could run any commercially available blood diagnostic on a device about the size of a large PC at lower cost than conventional labs that take up entire rooms.
Elizabeth Holmes recruited big names to her board of directors, like former Secretary of State Henry Kissinger and former Secretary of Defense James Mattis, and drew hundreds of millions of dollars in private investment. Feted at conferences, gracing the covers of glossy business magazines, Holmes was held up as an icon of female leadership and achievement. And in 2014, she became the world’s youngest female self-made billionaire, and her company was valued at over $9 billion.

But The Wall Street Journal reported in 2015 and 2016 that Theranos' devices were inaccurate and that the company was secretly resorting to running blood tests on other companies' machines, the very ones her company was supposed to be disrupting.
But the technology was faulty. Whenever someone would ask how Theranos could do what it purported to do, Holmes and others would respond that discussing the inner workings of their machines would reveal trade secrets. Theranos had simply repurposed commercially available blood analysis technology to run on smaller amounts of blood, The Wall Street Journal revealed in October 2015.

More here: https://www.nbcnews.com/business/business-news/elizabeth-holmes-verdict-theranos-trial-rcna9022