Ask HN: Was Theranos' product impossible or just a failure?

For any HNers in biochem, how ridiculous was the idea of what they were selling? Blood tests with small amounts of blood doesn't strike me as impossible, but I don't know anything about the subject.

Is this closer to AMD Bulldozer or to me raising $BILLIONS for my "quantum-computer-in-this-box-you-cant-open"?