Why we created a phone-sized device to take blood diagnostics out of the lab into the real world

When your doctor thinks you might have an infection or an allergy, a simple blood test should give answers within hours. But for much of the world, that test can take days – or never happen at all. The problem is not usually the test itself, but an overlooked step between taking your blood and performing the diagnosis.

In most hospitals in high-income countries, separating plasma from blood is so routine that most people never think about it. A nurse takes your blood, sends it to the lab, and a machine called…

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