Abstract:
This study has developed the measurement system for Kidney stone disease screening based on an Indole-reacted Calcium Oxalate Crystallization Index (iCOCI), which the change in color intensity affected by reactions between oxalate in urine and Indole reagent can be measured. We have studied various measurement parameters in order to improve the efficiency of the iCOCI method. We have found that the incubation time can be minimized to 10 minutes and the Indole reagent at a concentration of 2.5 mg/ml provides the highest sensitivity and specificity of the screening test. After that, the efficiency of the developed screening test was examined by measuring urine samples of healthy people (n=60) and kidney stones group (n=60) using the iCOCI method together with a developed optical measurement system based on a multi-wavelength sensor array. It was found that using the light absorbance value of the sample at a wavelength of 600 nm can provide the highest screening efficiency which its sensitivity and specificity are both more than 70%. This obtained efficiency might be sufficient for clinical practice. Moreover, the solution mixing and delivery system together with the display screen were developed to express the possibility of developing the whole system into an automated system controlled by microcontroller (MCU). From the tests, it was found that all developed systems could be used in measurements that imitated the actual field test outside the hospital. Therefore, it is possible to use this developed system for screening kidney disease as the optional non-invasive method.