Using a smartwatch to measure pulses and a smartphone app to monitor blood pressure: wearable sensors already track some of the body’s vital functions fairly reliably, and some of these devices can already be used in clinical diagnostics. However, diagnoses based on biochemical data still require samples of body fluids such as blood and urine, which have to be sent to the lab for analysis. Collecting these can be painful and complicated as well as time-consuming and often costly.
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