When she first came up with the precursor to the idea of Theranos, which eventually aimed to reap vast amounts of data from a few droplets of blood derived from the tip of a finger, she approached several of her professors at Stanford, according to someone who knew Holmes back then. But most explained to the chemical-engineering major that it was virtually impossible to do so with any real efficacy. “I told her, I don’t think your idea is going to work,” Phyllis Gardner, a professor of medicine at Stanford, said to me, about Holmes’s seminal pitch for Theranos. As Gardner explained, it is impossible to get a precise result from the tip of a finger for most of the tests that Theranos would claim to conduct accurately. When a finger is pricked, the probe breaks up cells, allowing debris, among other things, to escape into the interstitial fluid. While it is feasible to test for pathogens this way, a pinprick is too unreliable for obtaining more nuanced readings. Furthermore, there isn’t that much reliable data that you can reap from such a small amount of blood. But Holmes was nothing if not determined. Rather than drop her idea, she tried to persuade Channing Robertson, her adviser at Stanford, to back her in her quest. He did. (“It would not be unusual for finger-stick testing to be met with skepticism,” says a spokesman for Theranos. “Patents from that period explain Elizabeth’s ideas and were foundational for the company’s current technologies.”)
Holmes subsequently raised $6 million in funding, the first of almost $700 million that would follow. Money often comes with strings attached in Silicon Valley, but even by its byzantine terms, Holmes’s were unusual. She took the money on the condition that she would not divulge to investors how her technology actually worked, and that she had final say and control over every aspect of her company. This surreptitiousness scared off some investors. When Google Ventures, which focuses more than 40 percent of its investments on medical technology, tried to perform due diligence on Theranos to weigh an investment, Theranos never responded. Eventually, Google Ventures sent a venture capitalist to a Theranos Walgreens Wellness Center to take the revolutionary pinprick blood test. As the V.C. sat in a chair and had several large vials of blood drawn from his arm, far more than a pinprick, it became apparent that something was amiss with Theranos’s promise.