We demonstrate a rapid and cost-effective particle agglutination-based sensor that is powered by holographic imaging and deep learning. A disposable capillary-based flow device is designed to host the agglutination reaction with a material cost of <2 cents/test. A mobile and inexpensive holographic microscope captures a movie of the reaction (~3 min), which is rapidly processed by trained neural networks to automatically measure the target analyte concentration within the sample. The efficacy of this mobile sensor was demonstrated by measuring C-reactive protein (CRP) concentration in human serum samples, accurately covering the high-sensitivity range (0-10µg/mL) and very high concentrations, far exceeding 10µg/mL.
Monitoring serum phosphate level is critical for patients with kidney disease and those undergoing dialysis. We report a POC serum phosphate measurement device, by integrating a disposable paper-based microfluidic chip with a smartphone-based measurement system. The inexpensive microfluidic chip collects a droplet of blood from the patient and isolates the serum, which then reacts with a malachite green reagent, resulting in a colorimetric change, measured using a smartphone-based device. This POC instrument was tested on clinical samples obtained from patients undergoing dialysis, and we observed a strong statistical correlation between our results and the tests performed in a clinical laboratory.
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