While studying at Stanford, Holmes developed a patent for a wearable patch that would diagnose health conditions and inject antibiotics into patients through their skin. This came before her experiments with blood testing, so Theranos and developing the Edison machine wasn't her original business plan.
Her original biotech company name also wasn't Theranos. According to "Bad Blood: Secrets and Lies in a Silicon Valley Startup," Holmes called the business Real-Time Cures first, and the name Theranos (combining "therapy" and "diagnosis") came later when she realised people were sceptical of the word "cure."
"The Dropout" does include mentions of Holmes's patch, but does not mention Real-Time Cures.