Non-invasive estimation of blood glucose a feasibility study

The present work demonstrates the feasibility of estimating blood glucose level using a microstrip antenna strapped on a patient´s arm. Some promising success has been shown by the RIT ETA Lab research group that an antenna´s resonant frequency can track, in real time, changes in glucose concentration. However, these changes in antenna response are unique to an individual. An equivalent circuit model has been developed to represent the input impedance with changing glucose levels. From a first set of measurements of input impedance in real time on a patient, the circuit elements are determined by curve fitting, in terms of the change in glucose level and incorporated into the expression for input impedance of the equivalent circuit The glucose level is estimated iteratively from subsequent measurements of the input impedance on the same patient The estimates, represented in the Clarke´s Error Grid, compare well with the measurements made by a traditional blood glucose meter.