You usually need more than a few drops of blood, saliva or urine to detect illnesses. Here’s why
Lumen Photos/ShutterstockIn the 2000s, biotech company Theranos promised to revolutionise blood testing. Founder Elizabeth Holmes claimed Theranos technology could perform hundreds of tests using just a finger-prick drop of blood. If true, their diagnostics would be faster, cheaper and more accessible.
Theranos raised hundreds of millions of...




