Abstract

An increase of 10-12 percent in the number of Filipinos afflicted with kidney or renal disease is recorded per year according to the National Kidney Transplant Institute. Thus, the diagnosis of calcium stone formation, or urinalysis, in urine is a significant contribution to the medical industry. This study presents a diagnostic LED photoresistor sensor that can selectively determine calcium stones in the presence of uric acid. The LED photoresistor sensor, with Hantek data logger, was used to determine the concentration of Ca (II) in the urine sample. The features of the sensor system have a signal stability of 0.0596 % relative standard deviation (RSD) and repeatability of 10.35% RSD when 80 ppm of standard Ca (II) is compared to a blank in the presence of 60 ppm of uric acid. The calcium sensor photoresistor shows a calibration curve of y=0.0001x-0.0023 with a limit of detection of 46.84 ppm. The linear coefficient of the calibration curve, R2 is 0.9902.

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