Many diseases leave biomarkers in the blood, but detecting them can be an involved and slow process.
The markers may be present in small quantities and blood has to be collected and then delivered to a laboratory for analysis - a process which can take hours or days.
But now a technique which makes uses of a smartphone could change this by providing results in minutes.
BBC Click's Spencer Kelly finds out more and speaks to Dr Nuno Reis, Lecturer in Chemical Engineering from Loughborough University.
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