Well - some of the tests have to be 100% reliable, because medication decisions are made on them, and the incorrect dosage can be harmful. It's not like a cheap $10 antigen tests that has sub 100% specificity and sensitivity - a bunch of the tests were trying to measure particular levels. Theranos was just overall horrible. They were trying to do some tests that were impossible based on the physics of what can be measured by pinprick blood.